diff --git a/src/nvim/ex_cmds2.c b/src/nvim/ex_cmds2.c
index 57153cf5a1..47774f5a99 100644
--- a/src/nvim/ex_cmds2.c
+++ b/src/nvim/ex_cmds2.c
@@ -6,6 +6,7 @@
 #include <inttypes.h>
 #include <stdbool.h>
 #include <string.h>
+#include <fcntl.h>
 
 #include "nvim/vim.h"
 #include "nvim/ascii.h"
diff --git a/src/nvim/fileio.c b/src/nvim/fileio.c
index 9069a46151..97360d1881 100644
--- a/src/nvim/fileio.c
+++ b/src/nvim/fileio.c
@@ -7,6 +7,7 @@
 #include <stdbool.h>
 #include <string.h>
 #include <inttypes.h>
+#include <fcntl.h>
 
 #include "nvim/vim.h"
 #include "nvim/ascii.h"
diff --git a/src/nvim/if_cscope.c b/src/nvim/if_cscope.c
index 2a766734fe..d236501b3f 100644
--- a/src/nvim/if_cscope.c
+++ b/src/nvim/if_cscope.c
@@ -11,6 +11,7 @@
 #include <assert.h>
 #include <errno.h>
 #include <inttypes.h>
+#include <fcntl.h>
 
 #include "nvim/vim.h"
 #include "nvim/ascii.h"
diff --git a/src/nvim/memfile.c b/src/nvim/memfile.c
index 137c7c49d3..8cf5642a80 100644
--- a/src/nvim/memfile.c
+++ b/src/nvim/memfile.c
@@ -40,6 +40,7 @@
 #include <limits.h>
 #include <string.h>
 #include <stdbool.h>
+#include <fcntl.h>
 
 #include "nvim/vim.h"
 #include "nvim/ascii.h"
diff --git a/src/nvim/memline.c b/src/nvim/memline.c
index c91a25df6e..f58b2ac38f 100644
--- a/src/nvim/memline.c
+++ b/src/nvim/memline.c
@@ -38,6 +38,7 @@
 #include <inttypes.h>
 #include <string.h>
 #include <stdbool.h>
+#include <fcntl.h>
 
 #include "nvim/ascii.h"
 #include "nvim/vim.h"
diff --git a/src/nvim/shada.c b/src/nvim/shada.c
index 59ef2a0d28..dcdf2195f8 100644
--- a/src/nvim/shada.c
+++ b/src/nvim/shada.c
@@ -5,6 +5,7 @@
 #include <stdint.h>
 #include <inttypes.h>
 #include <errno.h>
+#include <fcntl.h>
 #ifdef HAVE_UNISTD_H
 # include <unistd.h>
 #endif
diff --git a/src/nvim/undo.c b/src/nvim/undo.c
index 69ac18ad54..6b60f95f22 100644
--- a/src/nvim/undo.c
+++ b/src/nvim/undo.c
@@ -77,6 +77,7 @@
 #include <limits.h>
 #include <stdbool.h>
 #include <string.h>
+#include <fcntl.h>
 
 #include "nvim/vim.h"
 #include "nvim/ascii.h"