diff --git a/test/convolve_test.cc b/test/convolve_test.cc
index 2610264..de1ae04 100644
--- a/test/convolve_test.cc
+++ b/test/convolve_test.cc
@@ -396,8 +396,8 @@
   void CopyOutputToRef() {
     memcpy(output_ref_, output_, kOutputBufferSize);
 #if CONFIG_AOM_HIGHBITDEPTH
-    memcpy(output16_ref_, output16_,
-           kOutputBufferSize * sizeof(output16_ref_[0]));
+    // Copy 16-bit pixels values. The effective number of bytes is double.
+    memcpy(output16_ref_, output16_, sizeof(output16_[0]) * kOutputBufferSize);
 #endif
   }