diff --git a/Dockerfile b/Dockerfile
index cc3a745..db18b41 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,7 +8,7 @@ WORKDIR $GOPATH/src/github.com/pusher/oauth2_proxy
 
 # Fetch dependencies
 COPY go.mod go.sum ./
-RUN go mod download
+RUN GO111MODULE=on go mod download
 
 # Now pull in our code
 COPY . .
diff --git a/Dockerfile.arm64 b/Dockerfile.arm64
index 7138da8..5b3c1f5 100644
--- a/Dockerfile.arm64
+++ b/Dockerfile.arm64
@@ -8,7 +8,7 @@ WORKDIR $GOPATH/src/github.com/pusher/oauth2_proxy
 
 # Fetch dependencies
 COPY go.mod go.sum ./
-RUN go mod download
+RUN GO111MODULE=on go mod download
 
 # Now pull in our code
 COPY . .
diff --git a/Dockerfile.armv6 b/Dockerfile.armv6
index 15db884..5f5fe75 100644
--- a/Dockerfile.armv6
+++ b/Dockerfile.armv6
@@ -8,7 +8,7 @@ WORKDIR $GOPATH/src/github.com/pusher/oauth2_proxy
 
 # Fetch dependencies
 COPY go.mod go.sum ./
-RUN go mod download
+RUN GO111MODULE=on go mod download
 
 # Now pull in our code
 COPY . .