diff --git a/src/platform/nmp-object.c b/src/platform/nmp-object.c
index 9977e8425..84cedd1f3 100644
--- a/src/platform/nmp-object.c
+++ b/src/platform/nmp-object.c
@@ -1319,8 +1319,12 @@ _nmp_cache_update_add (NMPCache *cache, NMPObject *obj)
 	nm_assert (!obj->is_cached);
 	nmp_object_ref (obj);
 	nm_assert (!nm_multi_index_lookup_first_by_value (cache->idx_multi, &obj->object));
+#if GLIB_CHECK_VERSION(2, 40, 0)
 	if (!g_hash_table_add (cache->idx_main, obj))
 		g_assert_not_reached ();
+#else
+	g_hash_table_add (cache->idx_main, obj);
+#endif
 	obj->is_cached = TRUE;
 	_nmp_cache_update_cache (cache, obj, FALSE);
 }