diff --git a/CHANGELOG.md b/CHANGELOG.md
index c550b47e0..59dbafce9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -50,6 +50,7 @@
 - [#1663](https://github.com/influxdata/kapacitor/pull/1663): Fixed install/remove of kapacitor on non-systemd Debian/Ubuntu systems.
     Fixes packaging to not enable services on RHEL systems.
     Fixes issues with recusive symlinks on systemd systems.
+- [#1662](https://github.com/influxdata/kapacitor/issues/1662): Fix invalid default MQTT config.
 
 ## v1.3.3 [2017-08-11]
 
diff --git a/services/mqtt/config.go b/services/mqtt/config.go
index 7109df3c6..1506acef0 100644
--- a/services/mqtt/config.go
+++ b/services/mqtt/config.go
@@ -111,7 +111,7 @@ func (cs Configs) Validate() error {
 			return err
 		}
 	}
-	if defaultCount > 0 {
+	if defaultCount > 1 {
 		return errors.New("more than one configuration is marked as the default")
 	}
 	if defaultCount == 0 && len(cs) > 1 {