diff --git a/.builds/linux.yml b/.builds/linux.yml
index 6161bb71..4b2d3833 100644
--- a/.builds/linux.yml
+++ b/.builds/linux.yml
@@ -46,7 +46,8 @@ tasks:
      cd gio/cmd
      go test ./...
      go test -race ./...
-     go test -modfile=go.local.mod ./...
+     cd gogio # since we need -modfile to point at the parent directory
+     GOFLAGS=-modfile=../go.local.mod go test
  - test_example: |
      cd gio/example
      go test -race ./...
diff --git a/cmd/go.local.mod b/cmd/go.local.mod
index 774b55b4..fcd4cbfd 100644
--- a/cmd/go.local.mod
+++ b/cmd/go.local.mod
@@ -1,3 +1,9 @@
+// Keep in sync with go.mod; the only difference should be the gioui.org
+// replace. To use it:
+//
+//     cd gogio
+//     GOFLAGS=-modfile=../go.local.mod go test
+
 module gioui.org/cmd
 
 go 1.13
diff --git a/cmd/go.mod b/cmd/go.mod
index 788ac944..578a709e 100644
--- a/cmd/go.mod
+++ b/cmd/go.mod
@@ -3,7 +3,7 @@ module gioui.org/cmd
 go 1.13
 
 require (
-	gioui.org v0.0.0-20200503190452-8d9612f9aa46
+	gioui.org v0.0.0-20200510064036-c2cbcee78de0
 	github.com/chromedp/cdproto v0.0.0-20191114225735-6626966fbae4
 	github.com/chromedp/chromedp v0.5.2
 	golang.org/x/image v0.0.0-20190802002840-cff245a6509b
diff --git a/cmd/go.sum b/cmd/go.sum
index 10fd26b5..c5b09bf4 100644
--- a/cmd/go.sum
+++ b/cmd/go.sum
@@ -1,6 +1,6 @@
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-gioui.org v0.0.0-20200503190452-8d9612f9aa46 h1:7OFSBlHlymqJPrX54xUKnattrlsTxmVbTZwtFbG+kgU=
-gioui.org v0.0.0-20200503190452-8d9612f9aa46/go.mod h1:AHI9rFr6AEEHCb8EPVtb/p5M+NMJRKH58IOp8O3Je04=
+gioui.org v0.0.0-20200510064036-c2cbcee78de0 h1:8QYEZvEzu7Jtb6QGNRCV5/innPTrafeidxdcHZ67p6U=
+gioui.org v0.0.0-20200510064036-c2cbcee78de0/go.mod h1:AHI9rFr6AEEHCb8EPVtb/p5M+NMJRKH58IOp8O3Je04=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802 h1:1BDTz0u9nC3//pOCMdNH+CiXJVYJh5UQNCOBG7jbELc=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/chromedp/cdproto v0.0.0-20191114225735-6626966fbae4 h1:QD3KxSJ59L2lxG6MXBjNHxiQO2RmxTQ3XcK+wO44WOg=