diff --git a/mmv1/products/memcache/Instance.yaml b/mmv1/products/memcache/Instance.yaml
index 3c130c1f2c49..0059dd1fccae 100644
--- a/mmv1/products/memcache/Instance.yaml
+++ b/mmv1/products/memcache/Instance.yaml
@@ -146,7 +146,7 @@ properties:
       The major version of Memcached software. If not provided, latest supported version will be used.
       Currently the latest supported major version is MEMCACHE_1_5. The minor version will be automatically
       determined by our system based on the latest supported minor version.
-    default_value: :MEMCACHE_1_6_15
+    default_value: :MEMCACHE_1_5
     values:
       - :MEMCACHE_1_5
       - :MEMCACHE_1_6_15