diff --git a/src/backend/utils/init/miscinit.c b/src/backend/utils/init/miscinit.c
index 182d666852..cfc5afaa6f 100644
--- a/src/backend/utils/init/miscinit.c
+++ b/src/backend/utils/init/miscinit.c
@@ -842,6 +842,14 @@ InitializeSessionUserIdStandalone(void)
 
 	AuthenticatedUserId = BOOTSTRAP_SUPERUSERID;
 	SetSessionUserId(BOOTSTRAP_SUPERUSERID, true);
+
+	/*
+	 * XXX This should set SetConfigOption("session_authorization"), too.
+	 * Since we don't, C code will get NULL, and current_setting() will get an
+	 * empty string.
+	 */
+	SetConfigOption("is_superuser", "on",
+					PGC_INTERNAL, PGC_S_DYNAMIC_DEFAULT);
 }
 
 /*