diff --git a/builtin/providers/aws/resource_aws_sns_topic_policy.go b/builtin/providers/aws/resource_aws_sns_topic_policy.go
index d7bdaa6d8..1a831e453 100644
--- a/builtin/providers/aws/resource_aws_sns_topic_policy.go
+++ b/builtin/providers/aws/resource_aws_sns_topic_policy.go
@@ -30,6 +30,7 @@ func resourceAwsSnsTopicPolicy() *schema.Resource {
 			"policy": {
 				Type:             schema.TypeString,
 				Required:         true,
+				ValidateFunc:     validateJsonString,
 				DiffSuppressFunc: suppressEquivalentAwsPolicyDiffs,
 			},
 		},