diff --git a/internal/graphicsdriver/opengl/driver.go b/internal/graphicsdriver/opengl/driver.go
index a234266eb..581278168 100644
--- a/internal/graphicsdriver/opengl/driver.go
+++ b/internal/graphicsdriver/opengl/driver.go
@@ -32,6 +32,9 @@ func Get() *Driver {
 type Driver struct {
 	state   openGLState
 	context context
+
+	// drawCalled is true just after Draw is called. This holds true until ReplacePixels is called.
+	drawCalled bool
 }
 
 func (d *Driver) SetThread(thread *thread.Thread) {
@@ -108,6 +111,7 @@ func (d *Driver) SetVertices(vertices []float32, indices []uint16) {
 }
 
 func (d *Driver) Draw(indexLen int, indexOffset int, mode driver.CompositeMode, colorM *affine.ColorM, filter driver.Filter, address driver.Address) error {
+	d.drawCalled = true
 	if err := d.useProgram(mode, colorM, filter, address); err != nil {
 		return err
 	}
diff --git a/internal/graphicsdriver/opengl/image.go b/internal/graphicsdriver/opengl/image.go
index 216f285c4..d4da73c1e 100644
--- a/internal/graphicsdriver/opengl/image.go
+++ b/internal/graphicsdriver/opengl/image.go
@@ -92,7 +92,10 @@ func (i *Image) ReplacePixels(p []byte, x, y, width, height int) {
 
 	// glFlush is necessary on Android.
 	// glTexSubImage2D didn't work without this hack at least on Nexus 5x and NuAns NEO [Reloaded] (#211).
-	i.driver.context.flush()
+	if i.driver.drawCalled {
+		i.driver.context.flush()
+	}
+	i.driver.drawCalled = false
 	i.driver.context.texSubImage2D(i.textureNative, p, x, y, width, height)
 }