diff --git a/storage/app/upload_test.go b/storage/app/upload_test.go
index 0bc92ee..7260aa1 100644
--- a/storage/app/upload_test.go
+++ b/storage/app/upload_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 app
 
 import (
diff --git a/storage/db/dbtest/cloud.go b/storage/db/dbtest/cloud.go
index 5f418b6..3ddfd93 100644
--- a/storage/db/dbtest/cloud.go
+++ b/storage/db/dbtest/cloud.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build cloud
+// +build cloud,!plan9
 
 package dbtest
 
diff --git a/storage/db/dbtest/dbtest.go b/storage/db/dbtest/dbtest.go
index c0cb339..8fb0692 100644
--- a/storage/db/dbtest/dbtest.go
+++ b/storage/db/dbtest/dbtest.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 dbtest
 
 import (
diff --git a/storage/db/dbtest/nocloud.go b/storage/db/dbtest/nocloud.go
index 8b8117f..ba43c13 100644
--- a/storage/db/dbtest/nocloud.go
+++ b/storage/db/dbtest/nocloud.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !cloud
+// +build !cloud,!plan9
 
 package dbtest
 
diff --git a/storage/db/sqlite3/sqlite3.go b/storage/db/sqlite3/sqlite3.go
index 9fb50c5..6efb041 100644
--- a/storage/db/sqlite3/sqlite3.go
+++ b/storage/db/sqlite3/sqlite3.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 sqlite3 provides the sqlite3 driver for
 // x/perf/storage/db. It must be imported instead of go-sqlite3 to
 // ensure foreign keys are properly honored.
diff --git a/storage/localperfdata/app.go b/storage/localperfdata/app.go
index 8e90214..8c34828 100644
--- a/storage/localperfdata/app.go
+++ b/storage/localperfdata/app.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
+
 // Localperfdata runs an HTTP server for benchmark storage.
 //
 // Usage: