diff --git a/src/proto/misc2.pro b/src/proto/misc2.pro
index 3d1f10a..8baf43a 100644
--- a/src/proto/misc2.pro
+++ b/src/proto/misc2.pro
@@ -56,6 +56,7 @@
 void ga_init2 __ARGS((garray_T *gap, int itemsize, int growsize));
 int ga_grow __ARGS((garray_T *gap, int n));
 char_u *ga_concat_strings __ARGS((garray_T *gap, char *sep));
+void ga_add_string __ARGS((garray_T *gap, char_u *p));
 void ga_concat __ARGS((garray_T *gap, char_u *s));
 void ga_append __ARGS((garray_T *gap, int c));
 void append_ga_line __ARGS((garray_T *gap));