diff --git a/src/proto/ex_getln.pro b/src/proto/ex_getln.pro
index 688eb3d..f0d45a3 100644
--- a/src/proto/ex_getln.pro
+++ b/src/proto/ex_getln.pro
@@ -6,6 +6,7 @@
 int cmdline_overstrike __ARGS((void));
 int cmdline_at_end __ARGS((void));
 colnr_T cmdline_getvcol_cursor __ARGS((void));
+void free_cmdline_buf __ARGS((void));
 void putcmdline __ARGS((int c, int shift));
 void unputcmdline __ARGS((void));
 int put_on_cmdline __ARGS((char_u *str, int len, int redraw));