diff --git a/src/proto/quickfix.pro b/src/proto/quickfix.pro
index 7369a64..6712cf1 100644
--- a/src/proto/quickfix.pro
+++ b/src/proto/quickfix.pro
@@ -24,5 +24,6 @@
 int get_errorlist __ARGS((list_T *list));
 int set_errorlist __ARGS((list_T *list, int action));
 void ex_cbuffer __ARGS((exarg_T *eap));
+void ex_cexpr __ARGS((exarg_T *eap));
 void ex_helpgrep __ARGS((exarg_T *eap));
 /* vim: set ft=c : */