diff --git a/src/bin/pg_rewind/pg_rewind.c b/src/bin/pg_rewind/pg_rewind.c
index bfd44a284e2..f55ef4f2f85 100644
--- a/src/bin/pg_rewind/pg_rewind.c
+++ b/src/bin/pg_rewind/pg_rewind.c
@@ -1130,7 +1130,6 @@ static void
 ensureCleanShutdown(const char *argv0)
 {
 	int			ret;
-#define MAXCMDLEN (2 * MAXPGPATH)
 	char		exec_path[MAXPGPATH];
 	PQExpBuffer postgres_cmd;