diff --git a/internal/graphicsdriver/opengl/context_desktop.go b/internal/graphicsdriver/opengl/context_desktop.go
index c8454886b..fff5f6e13 100644
--- a/internal/graphicsdriver/opengl/context_desktop.go
+++ b/internal/graphicsdriver/opengl/context_desktop.go
@@ -22,7 +22,6 @@ package opengl
 import (
 	"errors"
 	"fmt"
-	"unsafe"
 
 	"github.com/hajimehoshi/ebiten/internal/driver"
 	"github.com/hajimehoshi/ebiten/internal/graphicsdriver/opengl/gl"
@@ -525,9 +524,9 @@ func (c *context) newPixelBufferObject(width, height int) buffer {
 	return bf
 }
 
-func (c *context) mapPixelBuffer(buffer buffer, t textureNative) unsafe.Pointer {
+func (c *context) mapPixelBuffer(buffer buffer, t textureNative) uintptr {
 	c.bindTexture(t)
-	var ptr unsafe.Pointer
+	var ptr uintptr
 	_ = c.t.Call(func() error {
 		gl.BindBuffer(gl.PIXEL_UNPACK_BUFFER, uint32(buffer))
 		ptr = gl.MapBuffer(gl.PIXEL_UNPACK_BUFFER, gl.READ_WRITE)
diff --git a/internal/graphicsdriver/opengl/gl/package_notwindows.go b/internal/graphicsdriver/opengl/gl/package_notwindows.go
index 2173c4aac..adc601cc2 100644
--- a/internal/graphicsdriver/opengl/gl/package_notwindows.go
+++ b/internal/graphicsdriver/opengl/gl/package_notwindows.go
@@ -626,9 +626,9 @@ func LinkProgram(program uint32) {
 	C.glowLinkProgram(gpLinkProgram, (C.GLuint)(program))
 }
 
-func MapBuffer(target uint32, access uint32) unsafe.Pointer {
+func MapBuffer(target uint32, access uint32) uintptr {
 	ret := C.glowMapBuffer(gpMapBuffer, (C.GLenum)(target), (C.GLenum)(access))
-	return (unsafe.Pointer)(ret)
+	return ret
 }
 
 func PixelStorei(pname uint32, param int32) {
diff --git a/internal/graphicsdriver/opengl/gl/package_windows.go b/internal/graphicsdriver/opengl/gl/package_windows.go
index 6d10fde21..f05184e21 100644
--- a/internal/graphicsdriver/opengl/gl/package_windows.go
+++ b/internal/graphicsdriver/opengl/gl/package_windows.go
@@ -271,9 +271,9 @@ func IsTexture(texture uint32) bool {
 	return ret != 0
 }
 
-func MapBuffer(target uint32, access uint32) unsafe.Pointer {
+func MapBuffer(target uint32, access uint32) uintptr {
 	ret, _, _ := syscall.Syscall(gpMapBuffer, 2, uintptr(target), uintptr(access), 0)
-	return unsafe.Pointer(ret)
+	return ret
 }
 
 func LinkProgram(program uint32) {
diff --git a/internal/graphicsdriver/opengl/pbo_desktop.go b/internal/graphicsdriver/opengl/pbo_desktop.go
index 86418dec3..2c1eb4748 100644
--- a/internal/graphicsdriver/opengl/pbo_desktop.go
+++ b/internal/graphicsdriver/opengl/pbo_desktop.go
@@ -30,7 +30,7 @@ const canUsePBO = true
 
 type pboState struct {
 	image     *Image
-	mappedPBO unsafe.Pointer
+	mappedPBO uintptr
 	mapped    []byte
 }
 
@@ -44,13 +44,13 @@ func (s *pboState) mapPBO(img *Image) {
 	s.image = img
 	s.mappedPBO = img.driver.context.mapPixelBuffer(img.pbo, img.textureNative)
 
-	if s.mappedPBO == nil {
+	if s.mappedPBO == 0 {
 		panic("opengl: mapPixelBuffer failed")
 	}
 
 	var mapped []byte
 	sh := (*reflect.SliceHeader)(unsafe.Pointer(&mapped))
-	sh.Data = uintptr(s.mappedPBO)
+	sh.Data = s.mappedPBO
 	sh.Len = 4 * w * h
 	sh.Cap = 4 * w * h
 	s.mapped = mapped
@@ -71,6 +71,6 @@ func (s *pboState) unmapPBO() {
 	i.driver.context.unmapPixelBuffer(i.pbo, w, h)
 
 	s.image = nil
-	s.mappedPBO = nil
+	s.mappedPBO = 0
 	s.mapped = nil
 }