diff --git a/src/bin/pg_basebackup/pg_basebackup.c b/src/bin/pg_basebackup/pg_basebackup.c
index f1fa6fb3dfaae0eb0388f283ea1ad3df1f6c52d0..dcc6cafee86b6906e7dd21731283d7034039d6d3 100644
--- a/src/bin/pg_basebackup/pg_basebackup.c
+++ b/src/bin/pg_basebackup/pg_basebackup.c
@@ -71,7 +71,7 @@ static pg_time_t last_progress_report = 0;
 static int32 maxrate = 0;		/* no limit by default */
 
 static bool forceoverwrite = false;
-#define MAX_EXCLUDE 65535
+#define MAX_EXCLUDE 255
 static int	num_exclude = 0;
 static char *excludes[MAX_EXCLUDE];
 static int target_gp_dbid = 0;