diff --git a/mongo-hardening.pkr.hcl b/mongo-hardening.pkr.hcl
index 2ad0ca9..9cb7de8 100644
--- a/mongo-hardening.pkr.hcl
+++ b/mongo-hardening.pkr.hcl
@@ -57,8 +57,8 @@ source "docker" "target" {
 
 # Run the process to harden the docker container
 build {
-  name = "harden"
-  sources = "source.docker.target"
+  name    = "harden"
+  sources = ["source.docker.target"]
 
   # Create docker volumes
   provisioner "shell-local" {
diff --git a/mongo-validate.pkr.hcl b/mongo-validate.pkr.hcl
index 4b2c89c..484e245 100644
--- a/mongo-validate.pkr.hcl
+++ b/mongo-validate.pkr.hcl
@@ -57,7 +57,7 @@ source "docker" "hardened" {
 # Run validation process
 build {
   name    = "validate"
-  sources = "source.docker.hardened"
+  sources = ["source.docker.hardened"]
 
   # docker ps
   provisioner "shell-local" {