diff --git a/CHANGELOG.md b/CHANGELOG.md
index 53afd8f..e6e9427 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## v1.1.1
+
+- [Add default value for `ingress_security_groups` attribute](https://github.com/babbel/terraform-aws-alb-for-vpc-internal-requests/pull/14)
+
 ## v1.1.0
 
 - [Bump hashicorp/aws dependency](https://github.com/babbel/terraform-aws-alb-for-vpc-internal-requests/pull/10)
diff --git a/_test/main.tf b/_test/main.tf
index f0aa987..caea43a 100644
--- a/_test/main.tf
+++ b/_test/main.tf
@@ -3,7 +3,7 @@ provider "aws" {
 }
 
 module "alb" {
-  source  = "./.."
+  source = "./.."
 
   name = "example"
 
@@ -21,7 +21,7 @@ module "alb" {
   target_group = { arn = "arn:aws:elasticloadbalancing:local:123456789012:targetgroup/some-service/0123456789abcdef" }
 
   tags = {
-    app  = "some-service"
-    env  = "production"
+    app = "some-service"
+    env = "production"
   }
 }
diff --git a/variables.tf b/variables.tf
index 428f480..cbde777 100644
--- a/variables.tf
+++ b/variables.tf
@@ -13,6 +13,8 @@ variable "ingress_security_groups" {
       id = string
     })
   )
+
+  default = {}
 }
 
 variable "name" {