diff --git a/build17_test.go b/build17_test.go
deleted file mode 100644
index f631630..0000000
--- a/build17_test.go
+++ /dev/null
@@ -1,10 +0,0 @@
-// +build go1.1
-// +build !go1.8
-
-package gb
-
-import "go/build"
-
-func nogoerr(dir string) error {
-	return &build.NoGoError{Dir: dir}
-}
diff --git a/build18_test.go b/build18_test.go
deleted file mode 100644
index 7bd4066..0000000
--- a/build18_test.go
+++ /dev/null
@@ -1,9 +0,0 @@
-// +build go1.8
-
-package gb
-
-import "go/build"
-
-func nogoerr(dir string) error {
-	return &build.NoGoError{Dir: dir}
-}
diff --git a/build_test.go b/build_test.go
index 94f7652..b93801c 100644
--- a/build_test.go
+++ b/build_test.go
@@ -374,3 +374,7 @@ func mktemp(t *testing.T) string {
 func mktmp() (string, error) {
 	return ioutil.TempDir("", "gb-test-")
 }
+
+func nogoerr(dir string) error {
+	return &build.NoGoError{Dir: dir}
+}