diff --git a/debug_ebitendebug.go b/debug_ebitendebug.go
deleted file mode 100644
index c0f7f1797..000000000
--- a/debug_ebitendebug.go
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright 2018 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.
-
-//go:build ebitendebug
-// +build ebitendebug
-
-package ebiten
-
-const isDebug = true
diff --git a/debug_notebitendebug.go b/debug_notebitendebug.go
deleted file mode 100644
index a0d87d525..000000000
--- a/debug_notebitendebug.go
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright 2018 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.
-
-//go:build !ebitendebug
-// +build !ebitendebug
-
-package ebiten
-
-const isDebug = false
diff --git a/imagedumper_desktop.go b/imagedumper_desktop.go
index e8bdfb858..6917c134b 100644
--- a/imagedumper_desktop.go
+++ b/imagedumper_desktop.go
@@ -22,6 +22,7 @@ import (
 	"os"
 	"time"
 
+	"github.com/hajimehoshi/ebiten/v2/internal/debug"
 	"github.com/hajimehoshi/ebiten/v2/internal/ui"
 )
 
@@ -135,7 +136,7 @@ func (i *imageDumper) update() error {
 		}
 
 		if keyname := envInternalImagesKey(); keyname != "" {
-			if isDebug {
+			if debug.IsDebug {
 				if key, ok := keyNameToKeyCode(keyname); ok {
 					i.hasDumpInternalImagesKey = true
 					i.dumpInternalImagesKey = key