diff --git a/puppet/services/heat-base.yaml b/puppet/services/heat-base.yaml
index 102d07a7ea..cb58a041ae 100644
--- a/puppet/services/heat-base.yaml
+++ b/puppet/services/heat-base.yaml
@@ -118,7 +118,7 @@ parameters:
         Cron to purge db entries marked as deleted and older than $age - Log destination
     default: '/dev/null'
   HeatMaxJsonBodySize:
-    default: 1048576
+    default: 4194304
     description: Maximum raw byte size of the Heat API JSON request body.
     type: number
   NotificationDriver: