diff --git a/src/proto/normal.pro b/src/proto/normal.pro
index 106d0e1..eff08df 100644
--- a/src/proto/normal.pro
+++ b/src/proto/normal.pro
@@ -1,4 +1,5 @@
 /* normal.c */
+int check_text_or_curbuf_locked(oparg_T *oap);
 void normal_cmd(oparg_T *oap, int toplevel);
 void check_visual_highlight(void);
 void end_visual_mode(void);