diff --git a/test/driver.js b/test/driver.js
index 36f2309e7..ccffa8c68 100644
--- a/test/driver.js
+++ b/test/driver.js
@@ -409,6 +409,7 @@ function info(message) {
 }
 
 function clear(ctx) {
+  ctx.beginPath();
   ctx.clearRect(0, 0, canvas.width, canvas.height);
 }