diff --git a/aws/resource_aws_transfer_user.go b/aws/resource_aws_transfer_user.go
index 47449b31dd6..633c2d63614 100644
--- a/aws/resource_aws_transfer_user.go
+++ b/aws/resource_aws_transfer_user.go
@@ -43,12 +43,14 @@ func resourceAwsTransferUser() *schema.Resource {
 				Elem: &schema.Resource{
 					Schema: map[string]*schema.Schema{
 						"entry": {
-							Type:     schema.TypeString,
-							Required: true,
+							Type:         schema.TypeString,
+							Required:     true,
+							ValidateFunc: validation.StringLenBetween(0, 1024),
 						},
 						"target": {
-							Type:     schema.TypeString,
-							Required: true,
+							Type:         schema.TypeString,
+							Required:     true,
+							ValidateFunc: validation.StringLenBetween(0, 1024),
 						},
 					},
 				},