diff --git a/ci/amd64/packer.build.amd64-debian.sh b/ci/amd64/packer.build.amd64-debian.sh
index 8da4c62..1970b41 100644
--- a/ci/amd64/packer.build.amd64-debian.sh
+++ b/ci/amd64/packer.build.amd64-debian.sh
@@ -3,7 +3,7 @@
 # install packer
 if ! packer version 2>/dev/null; then
   curl -fsSL https://apt.releases.hashicorp.com/gpg | sudo apt-key add -
-  sudo apt-add-repository "deb [arch=amd64] https://apt.releases.hashicorp.com $(lsb_release -cs) main"
+  sudo apt-add-repository -y "deb [arch=amd64] https://apt.releases.hashicorp.com $(lsb_release -cs) main"
   sudo apt-get update
   echo -e "\nInstalling packer..."
   sudo apt-get install -y packer