diff --git a/src/proto/misc1.pro b/src/proto/misc1.pro
index 2a7b87e..93bfff6 100644
--- a/src/proto/misc1.pro
+++ b/src/proto/misc1.pro
@@ -90,6 +90,7 @@
 int expand_wildcards __ARGS((int num_pat, char_u **pat, int *num_file, char_u ***file, int flags));
 int match_suffix __ARGS((char_u *fname));
 int unix_expandpath __ARGS((garray_T *gap, char_u *path, int wildoff, int flags, int didstar));
+void remove_duplicates __ARGS((garray_T *gap));
 int gen_expand_wildcards __ARGS((int num_pat, char_u **pat, int *num_file, char_u ***file, int flags));
 void addfile __ARGS((garray_T *gap, char_u *f, int flags));
 char_u *get_cmd_output __ARGS((char_u *cmd, char_u *infile, int flags));