diff --git a/Dockerfile b/Dockerfile
index 921665c..c631aee 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,6 @@
-FROM alpine:3
+ARG alpine
+
+FROM ${alpine} AS resource
 
 ARG VERSION
 ARG BUILD_DATE
@@ -21,4 +23,4 @@ RUN chmod +x /opt/resource/out /opt/resource/in /opt/resource/check
 
 ADD test/ /opt/resource-tests/
 RUN /opt/resource-tests/all.sh \
- && rm -rf /tmp/*
+    && rm -rf /tmp/*
diff --git a/Makefile b/Makefile
index 8d98caf..3c078b9 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,7 @@ VERSION ?= dev
 
 build:
 	docker build \
+	  --build-arg alpine="alpine:3" \
 	  --build-arg BUILD_DATE="$(shell date -u --iso-8601)" \
 	  --build-arg VCS_REF="$(shell git rev-parse --short HEAD)" \
 	  --build-arg VERSION="$(VERSION)" \