diff --git a/graphics/opengl/device.go b/graphics/opengl/device.go
index 9a09b6ea8..f9d0dcf66 100644
--- a/graphics/opengl/device.go
+++ b/graphics/opengl/device.go
@@ -28,6 +28,7 @@ import "C"
 import (
 	"github.com/hajimehoshi/go.ebiten/graphics"
 	"github.com/hajimehoshi/go.ebiten/graphics/matrix"
+	"runtime"
 )
 
 type Device struct {
@@ -96,3 +97,7 @@ func (device *Device) Update() {
 func (device *Device) TextureFactory() graphics.TextureFactory {
 	return device.context
 }
+
+func init() {
+	runtime.LockOSThread()
+}