diff --git a/scripts/docker-release/Dockerfile-release b/scripts/docker-release/Dockerfile-release
index aa92d3246..7a05f283c 100644
--- a/scripts/docker-release/Dockerfile-release
+++ b/scripts/docker-release/Dockerfile-release
@@ -34,6 +34,7 @@ RUN apk add --no-cache git curl openssh gnupg && \
     rm -f terraform_${TERRAFORM_VERSION}_linux_amd64.zip terraform_${TERRAFORM_VERSION}_SHA256SUMS*
 
 FROM alpine:3.9.2 as final
+ARG TERRAFORM_VERSION=UNSPECIFIED
 
 LABEL "com.hashicorp.terraform.version"="${TERRAFORM_VERSION}"