diff --git a/build-docker.sh b/build-docker.sh
index 79b68d4..a9a2ce3 100755
--- a/build-docker.sh
+++ b/build-docker.sh
@@ -14,6 +14,11 @@ if ! ${DOCKER} ps >/dev/null; then
 	exit 1
 fi
 
+# Pass APT_PROXY into Docker run environment
+if test -n "$APT_PROXY"; then
+	DOCKER_APT_PROXY="-e APT_PROXY=$APT_PROXY"
+fi
+
 CONFIG_FILE=""
 if [ -f "${DIR}/config" ]; then
 	CONFIG_FILE="${DIR}/config"
@@ -78,7 +83,7 @@ if [ "${CONTAINER_EXISTS}" != "" ]; then
 	trap 'echo "got CTRL+C... please wait 5s" && ${DOCKER} stop -t 5 ${CONTAINER_NAME}_cont' SIGINT SIGTERM
 	time ${DOCKER} run --rm --privileged \
 		--volume "${CONFIG_FILE}":/config:ro \
-		-e "GIT_HASH=${GIT_HASH}" \
+		-e "GIT_HASH=${GIT_HASH}" ${DOCKER_APT_PROXY} \
 		--volumes-from="${CONTAINER_NAME}" --name "${CONTAINER_NAME}_cont" \
 		pi-gen \
 		bash -e -o pipefail -c "dpkg-reconfigure qemu-user-static &&
@@ -89,7 +94,7 @@ else
 	trap 'echo "got CTRL+C... please wait 5s" && ${DOCKER} stop -t 5 ${CONTAINER_NAME}' SIGINT SIGTERM
 	time ${DOCKER} run --name "${CONTAINER_NAME}" --privileged \
 		--volume "${CONFIG_FILE}":/config:ro \
-		-e "GIT_HASH=${GIT_HASH}" \
+		-e "GIT_HASH=${GIT_HASH}" ${DOCKER_APT_PROXY} \
 		pi-gen \
 		bash -e -o pipefail -c "dpkg-reconfigure qemu-user-static &&
 	cd /pi-gen; ./build.sh ${BUILD_OPTS} &&