diff --git a/src/proto/version.pro b/src/proto/version.pro
index 3f371f9..e6fb78f 100644
--- a/src/proto/version.pro
+++ b/src/proto/version.pro
@@ -4,6 +4,7 @@
 int has_patch __ARGS((int n));
 void ex_version __ARGS((exarg_T *eap));
 void list_version __ARGS((void));
+void maybe_intro_message __ARGS((void));
 void intro_message __ARGS((int colon));
 void ex_intro __ARGS((exarg_T *eap));
 /* vim: set ft=c : */