diff --git a/src/bin/pg_upgrade/version.c b/src/bin/pg_upgrade/version.c
index b0c0132dc70..3a9f2afa793 100644
--- a/src/bin/pg_upgrade/version.c
+++ b/src/bin/pg_upgrade/version.c
@@ -11,6 +11,7 @@
 
 #include "pg_upgrade.h"
 
+#include "catalog/pg_class.h"
 
 
 /*