diff --git a/awx/api/serializers.py b/awx/api/serializers.py
index 3ba2488a5b..b94631f46c 100644
--- a/awx/api/serializers.py
+++ b/awx/api/serializers.py
@@ -2603,8 +2603,6 @@ class CredentialSerializer(BaseSerializer):
         return summary_dict
 
     def validate(self, attrs):
-        if self.instance and self.instance.managed_by_tower:
-            raise PermissionDenied(detail=_("Modifications not allowed for managed credentials"))
         return super(CredentialSerializer, self).validate(attrs)
 
     def get_validation_exclusions(self, obj=None):