diff --git a/src/nvim/eval/typval.h b/src/nvim/eval/typval.h
index c02351947b..2a4dd7b146 100644
--- a/src/nvim/eval/typval.h
+++ b/src/nvim/eval/typval.h
@@ -13,7 +13,7 @@
 #include "nvim/hashtab.h"
 #include "nvim/lib/queue.h"
 #include "nvim/macros.h"
-#include "nvim/mbyte.h"
+#include "nvim/mbyte_defs.h"
 #include "nvim/message.h"
 #include "nvim/pos.h"      // for linenr_T
 #include "nvim/profile.h"  // for proftime_T
diff --git a/src/nvim/grid.h b/src/nvim/grid.h
index c38748940d..4a8072bd96 100644
--- a/src/nvim/grid.h
+++ b/src/nvim/grid.h
@@ -6,6 +6,7 @@
 #include "nvim/ascii.h"
 #include "nvim/buffer_defs.h"
 #include "nvim/grid_defs.h"
+#include "nvim/mbyte.h"
 
 /// By default, all windows are drawn on a single rectangular grid, represented by
 /// this ScreenGrid instance. In multigrid mode each window will have its own
diff --git a/src/nvim/mbyte.h b/src/nvim/mbyte.h
index 1e5e332ad9..ffa8411675 100644
--- a/src/nvim/mbyte.h
+++ b/src/nvim/mbyte.h
@@ -6,7 +6,7 @@
 #include <string.h>
 
 #include "nvim/func_attr.h"
-#include "nvim/iconv.h"
+#include "nvim/mbyte_defs.h"
 #include "nvim/os/os_defs.h"  // For indirect
 #include "nvim/types.h"  // for char_u
 
@@ -19,52 +19,6 @@
 #define MB_BYTE2LEN(b)         utf8len_tab[b]
 #define MB_BYTE2LEN_CHECK(b)   (((b) < 0 || (b) > 255) ? 1 : utf8len_tab[b])
 
-// max length of an unicode char
-#define MB_MAXCHAR     6
-
-// properties used in enc_canon_table[] (first three mutually exclusive)
-#define ENC_8BIT       0x01
-#define ENC_DBCS       0x02
-#define ENC_UNICODE    0x04
-
-#define ENC_ENDIAN_B   0x10        // Unicode: Big endian
-#define ENC_ENDIAN_L   0x20        // Unicode: Little endian
-
-#define ENC_2BYTE      0x40        // Unicode: UCS-2
-#define ENC_4BYTE      0x80        // Unicode: UCS-4
-#define ENC_2WORD      0x100       // Unicode: UTF-16
-
-#define ENC_LATIN1     0x200       // Latin1
-#define ENC_LATIN9     0x400       // Latin9
-#define ENC_MACROMAN   0x800       // Mac Roman (not Macro Man! :-)
-
-/// Flags for vimconv_T
-typedef enum {
-  CONV_NONE      = 0,
-  CONV_TO_UTF8   = 1,
-  CONV_9_TO_UTF8 = 2,
-  CONV_TO_LATIN1 = 3,
-  CONV_TO_LATIN9 = 4,
-  CONV_ICONV     = 5,
-} ConvFlags;
-
-#define MBYTE_NONE_CONV { \
-  .vc_type = CONV_NONE, \
-  .vc_factor = 1, \
-  .vc_fail = false, \
-}
-
-/// Structure used for string conversions
-typedef struct {
-  int vc_type;  ///< Zero or more ConvFlags.
-  int vc_factor;  ///< Maximal expansion factor.
-#ifdef HAVE_ICONV
-  iconv_t vc_fd;  ///< Value for CONV_ICONV.
-#endif
-  bool vc_fail;  ///< What to do with invalid characters: if true, fail,
-                 ///< otherwise use '?'.
-} vimconv_T;
-
 extern const uint8_t utf8len_tab_zero[256];
 
 extern const uint8_t utf8len_tab[256];
diff --git a/src/nvim/mbyte_defs.h b/src/nvim/mbyte_defs.h
new file mode 100644
index 0000000000..53b01a211f
--- /dev/null
+++ b/src/nvim/mbyte_defs.h
@@ -0,0 +1,56 @@
+#ifndef NVIM_MBYTE_DEFS_H
+#define NVIM_MBYTE_DEFS_H
+
+#include <stdbool.h>
+
+#include "nvim/iconv.h"
+
+/// max length of an unicode char
+enum { MB_MAXCHAR = 6, };
+
+/// properties used in enc_canon_table[] (first three mutually exclusive)
+enum {
+  ENC_8BIT     = 0x01,
+  ENC_DBCS     = 0x02,
+  ENC_UNICODE  = 0x04,
+
+  ENC_ENDIAN_B = 0x10,       ///< Unicode: Big endian
+  ENC_ENDIAN_L = 0x20,       ///< Unicode: Little endian
+
+  ENC_2BYTE    = 0x40,       ///< Unicode: UCS-2
+  ENC_4BYTE    = 0x80,       ///< Unicode: UCS-4
+  ENC_2WORD    = 0x100,      ///< Unicode: UTF-16
+
+  ENC_LATIN1   = 0x200,      ///< Latin1
+  ENC_LATIN9   = 0x400,      ///< Latin9
+  ENC_MACROMAN = 0x800,      ///< Mac Roman (not Macro Man! :-)
+};
+
+/// Flags for vimconv_T
+typedef enum {
+  CONV_NONE      = 0,
+  CONV_TO_UTF8   = 1,
+  CONV_9_TO_UTF8 = 2,
+  CONV_TO_LATIN1 = 3,
+  CONV_TO_LATIN9 = 4,
+  CONV_ICONV     = 5,
+} ConvFlags;
+
+#define MBYTE_NONE_CONV { \
+  .vc_type = CONV_NONE, \
+  .vc_factor = 1, \
+  .vc_fail = false, \
+}
+
+/// Structure used for string conversions
+typedef struct {
+  int vc_type;    ///< Zero or more ConvFlags.
+  int vc_factor;  ///< Maximal expansion factor.
+#ifdef HAVE_ICONV
+  iconv_t vc_fd;  ///< Value for CONV_ICONV.
+#endif
+  bool vc_fail;   ///< What to do with invalid characters: if true, fail,
+                  ///< otherwise use '?'.
+} vimconv_T;
+
+#endif  // NVIM_MBYTE_DEFS_H