diff --git a/test/frame_size_tests.cc b/test/frame_size_tests.cc
index d2012df..20aea31 100644
--- a/test/frame_size_tests.cc
+++ b/test/frame_size_tests.cc
@@ -140,6 +140,7 @@
     const aom_codec_cx_pkt_t *pkt;
 
     for (int i = 0; i < kNumFramesPerResolution; ++i) {
+      video.Next();  // SetSize() does not call FillFrame().
       EXPECT_EQ(aom_codec_encode(enc.get(), video.img(), video.pts(),
                                  video.duration(), /*flags=*/0),
                 AOM_CODEC_OK);
@@ -155,7 +156,6 @@
         }
         frame_count++;
       }
-      video.Next();
     }
   }