diff --git a/contrib/pg_upgrade/file.c b/contrib/pg_upgrade/file.c
index e5d1613182..c7b6f5cbfa 100644
--- a/contrib/pg_upgrade/file.c
+++ b/contrib/pg_upgrade/file.c
@@ -333,22 +333,6 @@ pg_scandir_internal(const char *dirname,
 #endif
 
 
-/*
- *	dir_matching_filenames
- *
- *	Return only matching file names during directory scan
- */
-int
-dir_matching_filenames(const struct dirent * scan_ent)
-{
-	/* we only compare for string length because the number suffix varies */
-	if (!strncmp(scandir_file_pattern, scan_ent->d_name, strlen(scandir_file_pattern)))
-		return 1;
-
-	return 0;
-}
-
-
 void
 check_hard_link(void)
 {
diff --git a/contrib/pg_upgrade/pg_upgrade.h b/contrib/pg_upgrade/pg_upgrade.h
index b7e4ea5127..d64c72a5cd 100644
--- a/contrib/pg_upgrade/pg_upgrade.h
+++ b/contrib/pg_upgrade/pg_upgrade.h
@@ -333,7 +333,6 @@ const char *setupPageConverter(pageCnvCtx **result);
 typedef void *pageCnvCtx;
 #endif
 
-int			dir_matching_filenames(const struct dirent * scan_ent);
 int pg_scandir(const char *dirname, struct dirent *** namelist,
 		   int (*selector) (const struct dirent *));
 const char *copyAndUpdateFile(pageCnvCtx *pageConverter, const char *src,