diff --git a/src/proto/insexpand.pro b/src/proto/insexpand.pro
index a9ca289..8529b7b 100644
--- a/src/proto/insexpand.pro
+++ b/src/proto/insexpand.pro
@@ -66,4 +66,5 @@
 void ins_compl_check_keys(int frequency, int in_compl_func);
 int ins_complete(int c, int enable_pum);
 void free_insexpand_stuff(void);
+int ins_compl_cancel(void);
 /* vim: set ft=c : */