diff --git a/terraform/vpc.tf b/terraform/vpc.tf
index 67f29f3..07ffff6 100644
--- a/terraform/vpc.tf
+++ b/terraform/vpc.tf
@@ -11,6 +11,7 @@ resource "aws_subnet" "public_subnet" {
   vpc_id                  = aws_vpc.vpc.id
   cidr_block              = "10.0.1.0/24"
   map_public_ip_on_launch = true
+  availability_zone       = var.availability_zone
   tags = {
     Name = var.subnet-name
   }