Fix unsigned/signed warning on macOS.

diff --git a/test/verify_test.cc b/test/verify_test.cc
index 23b96c3252038e1a79f9346c3d8737e96dbe3c8e..370204e90a0ba8626f56a89150d9c572b57ed446 100644 (file)
--- a/test/verify_test.cc
+++ b/test/verify_test.cc
@@ -353,7 +353,7 @@ BOOST_AUTO_TEST_CASE (verify_no_error)
        ++st;
        BOOST_REQUIRE (st == stages.end());
 
-       BOOST_CHECK_EQUAL (notes.size(), 0);
+       BOOST_CHECK_EQUAL (notes.size(), 0U);
 }