diff --git a/src/diff.c b/src/diff.c
index 392fef00c9..5a21df2d0c 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -728,10 +728,10 @@ void ex_diffupdate(exarg_T *eap)
           }
           fclose(fd);
         }
-        mch_remove(tmp_diff);
-        mch_remove(tmp_new);
+        os_remove((char *)tmp_diff);
+        os_remove((char *)tmp_new);
       }
-      mch_remove(tmp_orig);
+      os_remove((char *)tmp_orig);
     }
 
     // When using 'diffexpr' break here.
@@ -790,10 +790,10 @@ void ex_diffupdate(exarg_T *eap)
 
     // Read the diff output and add each entry to the diff list.
     diff_read(idx_orig, idx_new, tmp_diff);
-    mch_remove(tmp_diff);
-    mch_remove(tmp_new);
+    os_remove((char *)tmp_diff);
+    os_remove((char *)tmp_new);
   }
-  mch_remove(tmp_orig);
+  os_remove((char *)tmp_orig);
 
   // force updating cursor position on screen
   curwin->w_valid_cursor.lnum = 0;
@@ -959,10 +959,10 @@ void ex_diffpatch(exarg_T *eap)
   // Delete any .orig or .rej file created.
   STRCPY(buf, tmp_new);
   STRCAT(buf, ".orig");
-  mch_remove(buf);
+  os_remove((char *)buf);
   STRCPY(buf, tmp_new);
   STRCAT(buf, ".rej");
-  mch_remove(buf);
+  os_remove((char *)buf);
 
   // Only continue if the output file was created.
   if ((mch_stat((char *)tmp_new, &st) < 0) || (st.st_size == 0)) {
@@ -1008,12 +1008,12 @@ void ex_diffpatch(exarg_T *eap)
 
 theend:
   if (tmp_orig != NULL) {
-    mch_remove(tmp_orig);
+    os_remove((char *)tmp_orig);
   }
   vim_free(tmp_orig);
 
   if (tmp_new != NULL) {
-    mch_remove(tmp_new);
+    os_remove((char *)tmp_new);
   }
   vim_free(tmp_new);
   vim_free(newname);
diff --git a/src/eval.c b/src/eval.c
index e1f7de3707..0c6f2911b3 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -1187,7 +1187,7 @@ int eval_printexpr(char_u *fname, char_u *args)
   set_vim_var_string(VV_CMDARG, NULL, -1);
 
   if (err) {
-    mch_remove(fname);
+    os_remove((char *)fname);
     return FAIL;
   }
   return OK;
@@ -8413,7 +8413,7 @@ static void f_delete(typval_T *argvars, typval_T *rettv)
   if (check_restricted() || check_secure())
     rettv->vval.v_number = -1;
   else
-    rettv->vval.v_number = mch_remove(get_tv_string(&argvars[0]));
+    rettv->vval.v_number = os_remove((char *)get_tv_string(&argvars[0]));
 }
 
 /*
@@ -14702,7 +14702,7 @@ static void f_system(typval_T *argvars, typval_T *rettv)
 
 done:
   if (infile != NULL) {
-    mch_remove(infile);
+    os_remove((char *)infile);
     vim_free(infile);
   }
   rettv->v_type = VAR_STRING;
diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index 7b04171286..9c843137f6 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -1207,9 +1207,9 @@ filterend:
     EMSG(_("E135: *Filter* Autocommands must not change current buffer"));
   }
   if (itmp != NULL)
-    mch_remove(itmp);
+    os_remove((char *)itmp);
   if (otmp != NULL)
-    mch_remove(otmp);
+    os_remove((char *)otmp);
   vim_free(itmp);
   vim_free(otmp);
 }
@@ -1712,9 +1712,9 @@ void write_viminfo(char_u *file, int forceit)
      * In case of an error keep the original viminfo file.
      * Otherwise rename the newly written file.
      */
-    if (viminfo_errcnt || vim_rename(tempname, fname) == -1)
-      mch_remove(tempname);
-
+    if (viminfo_errcnt || vim_rename(tempname, fname) == -1) {
+      os_remove((char *)tempname);
+    }
   }
 
 end:
diff --git a/src/fileio.c b/src/fileio.c
index 7ae771c6b4..f98ed4ecb9 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -870,7 +870,7 @@ retry:
       }
     }
     if (tmpname != NULL) {
-      mch_remove(tmpname);                      /* delete converted file */
+      os_remove((char *)tmpname);  // delete converted file
       vim_free(tmpname);
       tmpname = NULL;
     }
@@ -1786,7 +1786,7 @@ failed:
 #endif
 
   if (tmpname != NULL) {
-    mch_remove(tmpname);                /* delete converted file */
+    os_remove((char *)tmpname);  // delete converted file
     vim_free(tmpname);
   }
   --no_wait_return;                     /* may wait for return now */
@@ -2203,7 +2203,7 @@ readfile_charconvert (
      * another type of conversion might still work. */
     MSG(errmsg);
     if (tmpname != NULL) {
-      mch_remove(tmpname);              /* delete converted file */
+      os_remove((char *)tmpname);  // delete converted file
       vim_free(tmpname);
       tmpname = NULL;
     }
@@ -2972,7 +2972,7 @@ buf_write (
           /* Close the file before removing it, on MS-Windows we
            * can't delete an open file. */
           close(fd);
-          mch_remove(IObuff);
+          os_remove((char *)IObuff);
         }
       }
     }
@@ -3140,7 +3140,7 @@ buf_write (
          */
         if (backup != NULL) {
           /* remove old backup, if present */
-          mch_remove(backup);
+          os_remove((char *)backup);
           /* Open with O_EXCL to avoid the file being created while
            * we were sleeping (symlink hacker attack?) */
           bfd = mch_open((char *)backup,
@@ -3457,7 +3457,7 @@ nobackup:
     /*
      * A forced write will try to create a new file if the old one is
      * still readonly. This may also happen when the directory is
-     * read-only. In that case the mch_remove() will fail.
+     * read-only. In that case the os_remove() will fail.
      */
     if (errmsg == NULL) {
 #ifdef UNIX
@@ -3485,7 +3485,7 @@ nobackup:
             perm &= 0777;
 #endif
           if (!append)                      /* don't remove when appending */
-            mch_remove(wfname);
+            os_remove((char *)wfname);
           continue;
         }
       }
@@ -3513,7 +3513,7 @@ restore_backup:
             vim_rename(backup, fname);
           /* if original file does exist throw away the copy */
           if (mch_stat((char *)fname, &st) >= 0)
-            mch_remove(backup);
+            os_remove((char *)backup);
         } else {
           /* try to put the original file back */
           vim_rename(backup, fname);
@@ -3750,7 +3750,7 @@ restore_backup:
         end = 0;
       }
     }
-    mch_remove(wfname);
+    os_remove((char *)wfname);
     vim_free(wfname);
   }
 
@@ -3951,7 +3951,7 @@ restore_backup:
   /*
    * Remove the backup unless 'backup' option is set
    */
-  if (!p_bk && backup != NULL && mch_remove(backup) != 0)
+  if (!p_bk && backup != NULL && os_remove((char *)backup) != 0)
     EMSG(_("E207: Can't delete backup file"));
 
 
@@ -5036,7 +5036,7 @@ int vim_rename(char_u *from, char_u *to)
    * two files when the os_rename() fails.
    */
 
-  mch_remove(to);
+  os_remove((char *)to);
 
   /*
    * First try a normal rename, return if it works.
@@ -5109,7 +5109,7 @@ int vim_rename(char_u *from, char_u *to)
     EMSG2(errmsg, to);
     return -1;
   }
-  mch_remove(from);
+  os_remove((char *)from);
   return 0;
 }
 
@@ -5618,7 +5618,7 @@ void vim_deltempdir(void)
     if (gen_expand_wildcards(1, &NameBuff, &file_count, &files,
             EW_DIR|EW_FILE|EW_SILENT) == OK) {
       for (i = 0; i < file_count; ++i)
-        mch_remove(files[i]);
+        os_remove((char *)files[i]);
       FreeWild(file_count, files);
     }
     path_tail(NameBuff)[-1] = NUL;
diff --git a/src/if_cscope.c b/src/if_cscope.c
index 65155c3421..de3d7a82db 100644
--- a/src/if_cscope.c
+++ b/src/if_cscope.c
@@ -1120,7 +1120,7 @@ static int cs_find_common(char *opt, char *pat, int forceit, int verbose, int us
         qf_jump(qi, 0, 0, forceit);
       }
     }
-    mch_remove(tmp);
+    os_remove((char *)tmp);
     vim_free(tmp);
     vim_free(nummatches);
     return TRUE;
diff --git a/src/memfile.c b/src/memfile.c
index 30a5ed389d..3ca98603f9 100644
--- a/src/memfile.c
+++ b/src/memfile.c
@@ -239,7 +239,7 @@ void mf_close(memfile_T *mfp, int del_file)
       EMSG(_(e_swapclose));
   }
   if (del_file && mfp->mf_fname != NULL)
-    mch_remove(mfp->mf_fname);
+    os_remove((char *)mfp->mf_fname);
   /* free entries in used list */
   for (hp = mfp->mf_used_first; hp != NULL; hp = nextp) {
     total_mem_used -= hp->bh_page_count * mfp->mf_page_size;
@@ -285,7 +285,7 @@ mf_close_file (
   mfp->mf_fd = -1;
 
   if (mfp->mf_fname != NULL) {
-    mch_remove(mfp->mf_fname);                  /* delete the swap file */
+    os_remove((char *)mfp->mf_fname);  // delete the swap file
     vim_free(mfp->mf_fname);
     vim_free(mfp->mf_ffname);
     mfp->mf_fname = NULL;
diff --git a/src/memline.c b/src/memline.c
index d60f348fc4..469518d70c 100644
--- a/src/memline.c
+++ b/src/memline.c
@@ -3727,11 +3727,12 @@ findswapname (
               same = TRUE;
             close(f2);
             if (created2)
-              mch_remove(fname2);
+              os_remove((char *)fname2);
           }
           close(f1);
-          if (created1)
-            mch_remove(fname);
+          if (created1) {
+            os_remove((char *)fname);
+          }
         }
         vim_free(fname2);
         if (same) {
@@ -3867,7 +3868,7 @@ findswapname (
           if (dummyfd != NULL) {
             fclose(dummyfd);
             dummyfd = NULL;
-            mch_remove(buf_fname);
+            os_remove(buf_fname);
             did_use_dummy = TRUE;
           }
 #endif
@@ -3941,7 +3942,7 @@ findswapname (
               swap_exists_action = SEA_RECOVER;
               break;
             case 4:
-              mch_remove(fname);
+              os_remove((char *)fname);
               break;
             case 5:
               swap_exists_action = SEA_QUIT;
@@ -3996,7 +3997,7 @@ findswapname (
 #ifdef CREATE_DUMMY_FILE
   if (dummyfd != NULL) {        /* file has been created temporarily */
     fclose(dummyfd);
-    mch_remove(buf_fname);
+    os_remove(buf_fname);
   }
 #endif
   return fname;
diff --git a/src/misc1.c b/src/misc1.c
index 180c658064..bf72b0dc3e 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -3535,7 +3535,7 @@ get_cmd_output (
   buffer = alloc(len + 1);
   i = (int)fread((char *)buffer, (size_t)1, (size_t)len, fd);
   fclose(fd);
-  mch_remove(tempname);
+  os_remove((char *)tempname);
   if (buffer == NULL)
     goto done;
   if (i != len) {
diff --git a/src/os_unix.c b/src/os_unix.c
index 9727140597..d5dcde128d 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -1256,7 +1256,7 @@ int flags;                      /* EW_* flags */
   vim_free(command);
 
   if (i != 0) {                         /* mch_call_shell() failed */
-    mch_remove(tempname);
+    os_remove((char *)tempname);
     vim_free(tempname);
     /*
      * With interactive completion, the error message is not printed.
@@ -1296,7 +1296,7 @@ int flags;                      /* EW_* flags */
   buffer = alloc(len + 1);
   i = fread((char *)buffer, 1, len, fd);
   fclose(fd);
-  mch_remove(tempname);
+  os_remove((char *)tempname);
   if (i != (int)len) {
     /* unexpected read error */
     EMSG2(_(e_notread), tempname);
diff --git a/src/os_unix_defs.h b/src/os_unix_defs.h
index 621e461030..f4ae6b95ba 100644
--- a/src/os_unix_defs.h
+++ b/src/os_unix_defs.h
@@ -32,7 +32,6 @@
 
 #define vim_mkdir(x, y) os_mkdir((char *)(x), (y))
 #define mch_rmdir(x)    os_rmdir((char *)(x))
-#define mch_remove(x)   os_remove((char *)(x))
 
 /* The number of arguments to a signal handler is configured here. */
 /* It used to be a long list of almost all systems. Any system that doesn't
diff --git a/src/quickfix.c b/src/quickfix.c
index fe0ef8ad6a..a480fe03ae 100644
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -2509,7 +2509,7 @@ void ex_make(exarg_T *eap)
   fname = get_mef_name();
   if (fname == NULL)
     return;
-  mch_remove(fname);        /* in case it's not unique */
+  os_remove((char *)fname);  // in case it's not unique
 
   /*
    * If 'shellpipe' empty: don't redirect to 'errorfile'.
@@ -2554,7 +2554,7 @@ void ex_make(exarg_T *eap)
   if (res > 0 && !eap->forceit)
     qf_jump(qi, 0, 0, FALSE);                   /* display first error */
 
-  mch_remove(fname);
+  os_remove((char *)fname);
   vim_free(fname);
   vim_free(cmd);
 }
diff --git a/src/spell.c b/src/spell.c
index 60e1fb172c..ea3f0787e3 100644
--- a/src/spell.c
+++ b/src/spell.c
@@ -4228,9 +4228,9 @@ void spell_delete_wordlist(void)
   char_u fname[MAXPATHL];
 
   if (int_wordlist != NULL) {
-    mch_remove(int_wordlist);
+    os_remove((char *)int_wordlist);
     int_wordlist_spl(fname);
-    mch_remove(fname);
+    os_remove((char *)fname);
     vim_free(int_wordlist);
     int_wordlist = NULL;
   }
diff --git a/src/undo.c b/src/undo.c
index f4e95c43f7..c4345ccf7e 100644
--- a/src/undo.c
+++ b/src/undo.c
@@ -1189,7 +1189,7 @@ void u_write_undo(char_u *name, int forceit, buf_T *buf, char_u *hash)
         }
       }
     }
-    mch_remove(file_name);
+    os_remove((char *)file_name);
   }
 
   /* If there is no undo information at all, quit here after deleting any
@@ -1242,7 +1242,7 @@ void u_write_undo(char_u *name, int forceit, buf_T *buf, char_u *hash)
   if (fp == NULL) {
     EMSG2(_(e_not_open), file_name);
     close(fd);
-    mch_remove(file_name);
+    os_remove((char *)file_name);
     goto theend;
   }