diff --git a/cmd/getgo/download.go b/cmd/getgo/download.go
index a68f4744..8fdb2a79 100644
--- a/cmd/getgo/download.go
+++ b/cmd/getgo/download.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !plan9
+
 package main
 
 import (
diff --git a/cmd/getgo/download_test.go b/cmd/getgo/download_test.go
index 1a47823c..5a5cc291 100644
--- a/cmd/getgo/download_test.go
+++ b/cmd/getgo/download_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !plan9
+
 package main
 
 import (
diff --git a/cmd/getgo/main.go b/cmd/getgo/main.go
index 8d9fbd41..a92ae481 100644
--- a/cmd/getgo/main.go
+++ b/cmd/getgo/main.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !plan9
+
 // The getgo command installs Go to the user's system.
 package main
 
diff --git a/cmd/getgo/main_test.go b/cmd/getgo/main_test.go
index 932a7397..e430895f 100644
--- a/cmd/getgo/main_test.go
+++ b/cmd/getgo/main_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !plan9
+
 package main
 
 import (
diff --git a/cmd/getgo/path.go b/cmd/getgo/path.go
index 551ac42e..52e04627 100644
--- a/cmd/getgo/path.go
+++ b/cmd/getgo/path.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !plan9
+
 package main
 
 import (
diff --git a/cmd/getgo/path_test.go b/cmd/getgo/path_test.go
index 4cf66474..5355c6ea 100644
--- a/cmd/getgo/path_test.go
+++ b/cmd/getgo/path_test.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !plan9
+
 package main
 
 import (
diff --git a/cmd/getgo/steps.go b/cmd/getgo/steps.go
index eac6517d..41c57d24 100644
--- a/cmd/getgo/steps.go
+++ b/cmd/getgo/steps.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !plan9
+
 package main
 
 import (
diff --git a/cmd/getgo/system.go b/cmd/getgo/system.go
index 8b5b024d..07d6f857 100644
--- a/cmd/getgo/system.go
+++ b/cmd/getgo/system.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !plan9
+
 package main
 
 import (
diff --git a/cmd/godoc/godoc_test.go b/cmd/godoc/godoc_test.go
index 8b0c24e5..fe87128d 100644
--- a/cmd/godoc/godoc_test.go
+++ b/cmd/godoc/godoc_test.go
@@ -205,6 +205,9 @@ func TestWebIndex(t *testing.T) {
 
 // Basic integration test for godoc HTTP interface.
 func testWeb(t *testing.T, withIndex bool) {
+	if runtime.GOOS == "plan9" {
+		t.Skip("skipping on plan9; files to start up quickly enough")
+	}
 	bin, cleanup := buildGodoc(t)
 	defer cleanup()
 	addr := serverAddress(t)