diff --git a/contrib/pg_upgrade/version.c b/contrib/pg_upgrade/version.c
index acbc1f0f4e6..9b0301d3d4a 100644
--- a/contrib/pg_upgrade/version.c
+++ b/contrib/pg_upgrade/version.c
@@ -11,6 +11,8 @@
 
 #include "pg_upgrade.h"
 
+#include "catalog/pg_class.h"
+
 
 
 /*