diff --git a/src/proto/edit.pro b/src/proto/edit.pro
index 3939efc..5434b1c 100644
--- a/src/proto/edit.pro
+++ b/src/proto/edit.pro
@@ -12,6 +12,7 @@
 void ins_compl_show_pum __ARGS((void));
 char_u *find_word_start __ARGS((char_u *ptr));
 char_u *find_word_end __ARGS((char_u *ptr));
+int ins_compl_active __ARGS((void));
 void ins_compl_check_keys __ARGS((int frequency));
 int get_literal __ARGS((void));
 void insertchar __ARGS((int c, int flags, int second_indent));