diff --git a/src/pkg/go/build/build_test.go b/src/pkg/go/build/build_test.go
index 68a4180c90..398e31ce26 100644
--- a/src/pkg/go/build/build_test.go
+++ b/src/pkg/go/build/build_test.go
@@ -28,7 +28,7 @@ var buildPkgs = []struct {
 			GoFiles:      []string{"pkgtest.go"},
 			SFiles:       []string{"sqrt_" + runtime.GOARCH + ".s"},
 			Package:      "pkgtest",
-			Imports:      []string{"os"},
+			Imports:      []string{"bytes"},
 			TestImports:  []string{"fmt", "pkgtest"},
 			TestGoFiles:  sortstr([]string{"sqrt_test.go", "sqrt_" + runtime.GOARCH + "_test.go"}),
 			XTestGoFiles: []string{"xsqrt_test.go"},
diff --git a/src/pkg/go/build/pkgtest/pkgtest.go b/src/pkg/go/build/pkgtest/pkgtest.go
index 03ebb9893a..08eea1e2bc 100644
--- a/src/pkg/go/build/pkgtest/pkgtest.go
+++ b/src/pkg/go/build/pkgtest/pkgtest.go
@@ -4,9 +4,9 @@
 
 package pkgtest
 
-import "os"
+import "bytes"
 
-func Foo() os.Error {
+func Foo() *bytes.Buffer {
 	return nil
 }