diff --git a/test/test_browser.py b/test/test_browser.py
index 186bad2d23580..fbb2b3e4d59bb 100644
--- a/test/test_browser.py
+++ b/test/test_browser.py
@@ -3063,13 +3063,7 @@ def test_sdl2_canvas_write(self):
 
   @requires_graphics_hardware
   def test_sdl2_gl_frames_swap(self):
-    def post_build():
-      self.post_manual_reftest()
-      reftest = read_file('reftest.js')
-      reftest2 = reftest.replace("Module['postRun'] = doReftest;", '') # we don't want the very first frame
-      assert reftest != reftest2
-      create_file('reftest.js', reftest2)
-    self.reftest('test_sdl2_gl_frames_swap.c', 'test_sdl2_gl_frames_swap.png', args=['--proxy-to-worker', '-sGL_TESTING', '-sUSE_SDL=2'], manual_reference=True, post_build=post_build)
+    self.reftest('test_sdl2_gl_frames_swap.c', 'test_sdl2_gl_frames_swap.png', args=['--proxy-to-worker', '-sGL_TESTING', '-sUSE_SDL=2'], manual_reference=True, post_build=self.post_manual_reftest)
 
   @requires_graphics_hardware
   def test_sdl2_ttf(self):