diff --git a/src/edit.c b/src/edit.c
index 6bdeded..93b1342 100644
--- a/src/edit.c
+++ b/src/edit.c
@@ -1587,7 +1587,7 @@
  * Note that this doesn't wait for characters, they must be in the typeahead
  * buffer already.
  */
-    int
+    static int
 decodeModifyOtherKeys(int c)
 {
     char_u  *p = typebuf.tb_buf + typebuf.tb_off;