diff --git a/internal/graphicsdriver/opengl/context.go b/internal/graphicsdriver/opengl/context.go
index 3be3f5362..6cbdb1233 100644
--- a/internal/graphicsdriver/opengl/context.go
+++ b/internal/graphicsdriver/opengl/context.go
@@ -22,6 +22,7 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/opengl/gl"
 	"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
+	"github.com/hajimehoshi/ebiten/v2/internal/shaderir/glsl"
 )
 
 type blendFactor int
@@ -105,8 +106,6 @@ type context struct {
 	highp              bool
 	highpOnce          sync.Once
 	initOnce           sync.Once
-
-	contextPlatform
 }
 
 func (c *context) bindTexture(t textureNative) {
@@ -482,3 +481,10 @@ func (c *context) newElementArrayBuffer(size int) buffer {
 	c.ctx.BufferInit(gl.ELEMENT_ARRAY_BUFFER, size, gl.DYNAMIC_DRAW)
 	return buffer(b)
 }
+
+func (c *context) glslVersion() glsl.GLSLVersion {
+	if c.ctx.IsES() {
+		return glsl.GLSLVersionES300
+	}
+	return glsl.GLSLVersionDefault
+}
diff --git a/internal/graphicsdriver/opengl/context_js.go b/internal/graphicsdriver/opengl/context_js.go
deleted file mode 100644
index 6644b52d2..000000000
--- a/internal/graphicsdriver/opengl/context_js.go
+++ /dev/null
@@ -1,29 +0,0 @@
-// Copyright 2014 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 opengl
-
-import (
-	"syscall/js"
-
-	"github.com/hajimehoshi/ebiten/v2/internal/shaderir/glsl"
-)
-
-type contextPlatform struct {
-	canvas js.Value
-}
-
-func (c *context) glslVersion() glsl.GLSLVersion {
-	return glsl.GLSLVersionES300
-}
diff --git a/internal/graphicsdriver/opengl/context_notjs.go b/internal/graphicsdriver/opengl/context_notjs.go
deleted file mode 100644
index 2b11382e7..000000000
--- a/internal/graphicsdriver/opengl/context_notjs.go
+++ /dev/null
@@ -1,31 +0,0 @@
-// Copyright 2014 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.
-
-//go:build !js
-
-package opengl
-
-import (
-	"github.com/hajimehoshi/ebiten/v2/internal/shaderir/glsl"
-)
-
-type contextPlatform struct {
-}
-
-func (c *context) glslVersion() glsl.GLSLVersion {
-	if c.ctx.IsES() {
-		return glsl.GLSLVersionES300
-	}
-	return glsl.GLSLVersionDefault
-}
diff --git a/internal/graphicsdriver/opengl/graphics_js.go b/internal/graphicsdriver/opengl/graphics_js.go
index 1fd3f1c1e..5187a9b04 100644
--- a/internal/graphicsdriver/opengl/graphics_js.go
+++ b/internal/graphicsdriver/opengl/graphics_js.go
@@ -43,8 +43,5 @@ func NewGraphics(canvas js.Value) (graphicsdriver.Graphics, error) {
 		return nil, err
 	}
 
-	g := newGraphics(ctx)
-	g.context.canvas = canvas
-
-	return g, nil
+	return newGraphics(ctx), nil
 }