diff --git a/Dockerfile b/Dockerfile
index 4ddd1a8a..89e04a66 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,7 @@
 FROM golang:1.12 as builder
 ENV GO111MODULE=on
 ENV CGO_ENABLED=0
+ENV GOOS=linux
 WORKDIR /go/src/github.com/cloudflare/cloudflared/
 RUN apt-get update && apt-get install -y --no-install-recommends upx
 # Run after `apt-get update` to improve rebuild scenarios