diff --git a/src/proto/ex_cmds2.pro b/src/proto/ex_cmds2.pro
index 10277e8..63d377d 100644
--- a/src/proto/ex_cmds2.pro
+++ b/src/proto/ex_cmds2.pro
@@ -1,4 +1,5 @@
 /* ex_cmds2.c */
+int has_watchexpr (void);
 void do_debug(char_u *cmd);
 void ex_debug(exarg_T *eap);
 void dbg_check_breakpoint(exarg_T *eap);