diff --git a/src/vim.h b/src/vim.h
index 7de2b6f..989dd23 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -949,6 +949,7 @@
 #define INSCHAR_FORMAT	1	/* force formatting */
 #define INSCHAR_DO_COM	2	/* format comments */
 #define INSCHAR_CTRLV	4	/* char typed just after CTRL-V */
+#define INSCHAR_NO_FEX	8	/* don't use 'formatexpr' */
 
 /* flags for open_line() */
 #define OPENLINE_DELSPACES  1	/* delete spaces after cursor */