diff --git a/app/doc.go b/app/doc.go
index 25a7560..9bea908 100644
--- a/app/doc.go
+++ b/app/doc.go
@@ -57,7 +57,7 @@ goroutine as other code that calls OpenGL.
 					// ...
 				case paint.Event:
 					log.Print("Call OpenGL here.")
-					a.EndPaint()
+					a.EndPaint(e)
 				}
 			}
 		})
diff --git a/app/internal/testapp/testapp.go b/app/internal/testapp/testapp.go
index c4d868e..4904d72 100644
--- a/app/internal/testapp/testapp.go
+++ b/app/internal/testapp/testapp.go
@@ -59,7 +59,7 @@ func main() {
 					comm.Send("paint")
 					sendPainting = false
 				}
-				a.EndPaint()
+				a.EndPaint(e)
 			case touch.Event:
 				comm.Send("touch", e.Type, e.Loc.X.Px(c.PixelsPerPt), e.Loc.Y.Px(c.PixelsPerPt))
 			}