diff --git a/graphics/opengl/ids.go b/graphics/opengl/ids.go
index c93c215b0..664ec3633 100644
--- a/graphics/opengl/ids.go
+++ b/graphics/opengl/ids.go
@@ -7,7 +7,7 @@ import "C"
 import (
 	"github.com/hajimehoshi/ebiten/graphics"
 	"github.com/hajimehoshi/ebiten/graphics/matrix"
-	"github.com/hajimehoshi/ebiten/graphics/opengl/shader"
+	"github.com/hajimehoshi/ebiten/graphics/opengl/internal/shader"
 	"image"
 	"math"
 	"sync"
diff --git a/graphics/opengl/shader/drawtexture.go b/graphics/opengl/internal/shader/drawtexture.go
similarity index 100%
rename from graphics/opengl/shader/drawtexture.go
rename to graphics/opengl/internal/shader/drawtexture.go
diff --git a/graphics/opengl/shader/program.go b/graphics/opengl/internal/shader/program.go
similarity index 100%
rename from graphics/opengl/shader/program.go
rename to graphics/opengl/internal/shader/program.go
diff --git a/graphics/opengl/shader/shader.go b/graphics/opengl/internal/shader/shader.go
similarity index 100%
rename from graphics/opengl/shader/shader.go
rename to graphics/opengl/internal/shader/shader.go