diff --git a/appveyor.yml b/appveyor.yml
index ca41f62..5ec8a04 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -14,13 +14,14 @@ environment:
   GOVERSION: 1.11.x
   GO111MODULE: on
   GOPROXY: https://proxy.golang.org
-  GOFLAGS: -mod=readonly
 
 install:
   - set PATH=%GOPATH%\bin;C:\go\bin;%PATH%
   - go version
   - go env
   - go get github.com/urfave/gfmrun/cmd/gfmrun
+  - go get golang.org/x/tools/cmd/goimports
+  - go mod tidy
 
 build_script:
   - go run build.go vet