diff --git a/plv8.cc b/plv8.cc
index edfa2aa..623e7f2 100644
--- a/plv8.cc
+++ b/plv8.cc
@@ -385,7 +385,7 @@ _PG_init(void)
                                    NULL,
                                    &plv8_v8_flags,
                                    NULL,
-                                   PGC_USERSET, 0,
+                                   PGC_SUSET, 0,
 #if PG_VERSION_NUM >= 90100
                                    NULL,
 #endif