diff --git a/src/getchar.c b/src/getchar.c
index 196a3ae..52c7721 100644
--- a/src/getchar.c
+++ b/src/getchar.c
@@ -631,7 +631,7 @@
     add_buff(&readbuf2, s, -1L);
 }
 
-    void
+    static void
 stuffReadbuffLen(char_u *s, long len)
 {
     add_buff(&readbuf1, s, len);