diff --git a/examples/keyboard/keyboard/gen.go b/examples/keyboard/keyboard/gen.go
index 08330d9ed..4a9db6d8e 100644
--- a/examples/keyboard/keyboard/gen.go
+++ b/examples/keyboard/keyboard/gen.go
@@ -32,7 +32,6 @@ import (
 	"golang.org/x/image/font"
 
 	"github.com/hajimehoshi/ebiten"
-	"github.com/hajimehoshi/ebiten/internal"
 	"github.com/hajimehoshi/ebiten/text"
 )
 
@@ -261,6 +260,21 @@ func outputKeyboardImage() (map[ebiten.Key]image.Rectangle, error) {
 	return keyMap, nil
 }
 
+const license = `// Copyright 2013 The Ebiten Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+`
+
 const keyRectTmpl = `{{.License}}
 
 // Code generated by gen.go using 'go generate'. DO NOT EDIT.
@@ -285,10 +299,6 @@ func KeyRect(key ebiten.Key) (image.Rectangle, bool) {
 }`
 
 func outputKeyRectsGo(k map[ebiten.Key]image.Rectangle) error {
-	license, err := internal.LicenseComment()
-	if err != nil {
-		return err
-	}
 	path := "keyrects.go"
 
 	f, err := os.Create(path)
diff --git a/genkeys.go b/genkeys.go
index 88cf7c6ea..129c6a631 100644
--- a/genkeys.go
+++ b/genkeys.go
@@ -28,8 +28,6 @@ import (
 	"strconv"
 	"strings"
 	"text/template"
-
-	"github.com/hajimehoshi/ebiten/internal"
 )
 
 var (
@@ -348,12 +346,22 @@ func (k KeyNames) Swap(i, j int) {
 	k[i], k[j] = k[j], k[i]
 }
 
-func main() {
-	license, err := internal.LicenseComment()
-	if err != nil {
-		log.Fatal(err)
-	}
+const license = `// Copyright 2013 The Ebiten Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+`
 
+func main() {
 	// Follow the standard comment rule (https://golang.org/s/generatedcode).
 	doNotEdit := "// Code generated by genkeys.go using 'go generate'. DO NOT EDIT."
 
diff --git a/internal/license.go b/internal/license.go
deleted file mode 100644
index 171b3c83f..000000000
--- a/internal/license.go
+++ /dev/null
@@ -1,42 +0,0 @@
-// Copyright 2015 Hajime Hoshi
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package internal
-
-import (
-	"regexp"
-	"strconv"
-	"strings"
-)
-
-const license = `Copyright 2013 The Ebiten Authors
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-`
-
-// LicenseComment returns the license string in Go comment style.
-func LicenseComment() (string, error) {
-	lines := strings.Split(license, "\n")
-	return "// " + strings.Join(lines[:len(lines)-1], "\n// "), nil
-}