diff --git a/Dockerfile b/Dockerfile
index f3d11db..5e9cba0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,7 +12,9 @@ ARG VERSION
 # ==================================
 FROM ${BUILD_IMAGE} AS build
 COPY . /workspace
-RUN make ${EXECUTABLE_TARGET} VERSION=${VERSION} GOPROXY=${GOPROXY} GOPRIVATE=${GOPRIVATE}
+ENV GOPROXY=${GOPROXY}
+ENV GOPRIVATE=${GOPRIVATE}
+RUN make ${EXECUTABLE_TARGET} VERSION=${VERSION}
 
 # TARGET
 # ==================================
diff --git a/Makefile b/Makefile
index aa60c6a..ebb3990 100644
--- a/Makefile
+++ b/Makefile
@@ -3,14 +3,6 @@
 # value is taken.
 VERSION?=$(shell git describe --abbrev=0)+$(shell date +'%Y%m%d%H%I%S')
 
-# GOPROXY settings
-# If no GOPROXY environment variable available, the pre-defined GOPROXY from go
-# env to download and validate go modules is used. Exclude downloading and
-# validation of all private modules which are pre-defined in GOPRIVATE. If no
-# GOPRIVATE variable defined, the variable of go env is used.
-GOPROXY?=$(shell go env GOPROXY)
-GOPRIVATE?=$(shell go env GOPRIVATE)
-
 # CONTAINER_RUNTIME
 # The CONTAINER_RUNTIME variable will be used to specified the path to a
 # container runtime. This is needed to start and run a container images.
@@ -34,8 +26,8 @@ bin/linux/amd64/${EXECUTABLE}:
 	CGO_ENABLED=1 \
 	GOOS=linux \
 	GOARCH=amd64 \
-	GOPROXY=${GOPROXY} \
-	GOPRIVATE=${GOPRIVATE} \
+	GOPROXY=$(shell go env GOPROXY) \
+	GOPRIVATE=$(shell go env GOPRIVATE) \
 		go build -ldflags "-X main.version=${VERSION:v%=%}" -o ${@}
 
 bin/linux/arm/5/${EXECUTABLE}:
@@ -43,8 +35,8 @@ bin/linux/arm/5/${EXECUTABLE}:
 	GOOS=linux \
 	GOARCH=arm \
 	GOARM=5 \
-	GOPROXY=${GOPROXY} \
-	GOPRIVATE=${GOPRIVATE} \
+	GOPROXY=$(shell go env GOPROXY) \
+	GOPRIVATE=$(shell go env GOPRIVATE) \
 		go build -ldflags "-X main.version=${VERSION:v%=%}" -o ${@}
 
 bin/linux/arm/7/${EXECUTABLE}:
@@ -53,14 +45,14 @@ bin/linux/arm/7/${EXECUTABLE}:
 	GOOS=linux \
 	GOARCH=arm \
 	GOARM=7 \
-	GOPROXY=${GOPROXY} \
-	GOPRIVATE=${GOPRIVATE} \
+	GOPROXY=$(shell go env GOPROXY) \
+	GOPRIVATE=$(shell go env GOPRIVATE) \
 		go build -ldflags "-X main.version=${VERSION:v%=%}" -o ${@}
 
 bin/tmp/${EXECUTABLE}:
 	CGO_ENABLED=1 \
-	GOPROXY=${GOPROXY} \
-	GOPRIVATE=${GOPRIVATE} \
+	GOPROXY=$(shell go env GOPROXY) \
+	GOPRIVATE=$(shell go env GOPRIVATE) \
 		go build -ldflags "-X main.version=${VERSION:v%=%}" -o ${@}
 
 # CLEAN
@@ -87,8 +79,8 @@ container-image/build/amd64:
 		--build-arg BUILD_IMAGE=docker.io/volkerraschek/build-image:latest \
 		--build-arg EXECUTABLE=${EXECUTABLE} \
 		--build-arg EXECUTABLE_TARGET=bin/linux/amd64/${EXECUTABLE} \
-		--build-arg GOPROXY=${GOPROXY} \
-		--build-arg GOPRIVATE=${GOPRIVATE} \
+		--build-arg GOPROXY=$(shell go env GOPROXY) \
+		--build-arg GOPRIVATE=$(shell go env GOPRIVATE) \
 		--build-arg VERSION=${VERSION} \
 		--file Dockerfile \
 		--no-cache \
@@ -136,13 +128,13 @@ container-run/test/unit:
 PHONY+=container-run
 container-run:
 	${CONTAINER_RUNTIME} run \
+		--env GOPROXY=$(shell go env GOPROXY) \
+		--env GOPRIVATE=$(shell go env GOPRIVATE) \
 		--rm \
 		--volume ${PWD}:/workspace \
 		--volume /var/run/docker.sock:/var/run/docker.sock \
 		docker.io/volkerraschek/build-image:latest \
 			make ${COMMAND} \
-				GOPROXY=${GOPROXY} \
-				GOPRIVATE=${GOPRIVATE} \
 				VERSION=${VERSION:v%=%}
 
 # REMOTE