diff --git a/plugins/builder-dockerfile/builder-build b/plugins/builder-dockerfile/builder-build
index 5677fdaed..7ff239b92 100755
--- a/plugins/builder-dockerfile/builder-build
+++ b/plugins/builder-dockerfile/builder-build
@@ -20,6 +20,7 @@ trigger-builder-dockerfile-builder-build() {
   pushd "$SOURCECODE_WORK_DIR" &>/dev/null
 
   # extract first port from Dockerfile
+  dos2unix Dockerfile
   local DOCKERFILE_PORTS=$(get_dockerfile_exposed_ports Dockerfile)
   [[ -n "$DOCKERFILE_PORTS" ]] && config_set --no-restart "$APP" DOKKU_DOCKERFILE_PORTS="$DOCKERFILE_PORTS"
   plugn trigger pre-build-dockerfile "$APP"