diff --git a/contrib/pg_upgrade/util.c b/contrib/pg_upgrade/util.c
index ea7819d4aea61b117304984bfdffd4cd8b352a95..7f4458c0acef2c3b1f43695406af1b538b872368 100644
--- a/contrib/pg_upgrade/util.c
+++ b/contrib/pg_upgrade/util.c
@@ -9,6 +9,7 @@
 
 #include "postgres_fe.h"
 
+#include "common/username.h"
 #include "pg_upgrade.h"
 
 #include <signal.h>