diff --git a/src/bin/pg_upgrade/check.c b/src/bin/pg_upgrade/check.c
index c198896c9f..fe73ec4f00 100644
--- a/src/bin/pg_upgrade/check.c
+++ b/src/bin/pg_upgrade/check.c
@@ -521,6 +521,8 @@ check_for_data_types_usage(ClusterInfo *cluster, DataTypesUsageChecks * checks)
 	if (found)
 		pg_fatal("Data type checks failed: %s", report.data);
 
+	pg_free(results);
+
 	check_ok();
 }