diff --git a/main.tf b/main.tf
index 5881b98..eedbb81 100644
--- a/main.tf
+++ b/main.tf
@@ -136,6 +136,6 @@ resource "aws_security_group_rule" "egress" {
   from_port         = 0
   to_port           = 0
   protocol          = "-1"
-  cidr_blocks       = ["0.0.0.0/0"]
+  cidr_blocks       = var.destination_cidr_blocks == [] ? ["0.0.0.0/0"] : var.destination_cidr_blocks
   security_group_id = aws_security_group.default.id
 }
diff --git a/variables.tf b/variables.tf
index 5d2459f..22fa115 100644
--- a/variables.tf
+++ b/variables.tf
@@ -35,6 +35,11 @@ variable "source_cidr_blocks" {
   description = "List of source CIDR blocks."
 }
 
+variable "destination_cidr_blocks" {
+  type        = list(string)
+  description = "List of source CIDR blocks."
+}
+
 variable "engine_version" {
   default     = "5.0.6"
   type        = string