--- a/run_build.pl
+++ b/run_build.pl
@@ -1677 +1677,2 @@ sub make_pl_install_check
-		@checklog = run_log("cd $pgsql/src/pl && $make installcheck");
+		my $cmd = "cd $pgsql/src/pl && $make USE_MODULE_DB=1 installcheck";
+		@checklog = run_log($cmd);