diff --git a/test/arithmetic_test.cpp b/test/arithmetic_test.cpp
index 2f05779..14e0935 100644
--- a/test/arithmetic_test.cpp
+++ b/test/arithmetic_test.cpp
@@ -20,7 +20,7 @@
 // ***
 
 TEST_B BOOST_PP_ADD(2,3) == 5 TEST_E
-TEST_B BOOST_PP_ADD(11,BOOST_PP_SUB(BOOST_PP_LIMIT_MAG,10)) == BOOST_PP_LIMIT_MAG TEST_E
+TEST_B BOOST_PP_ADD(21,BOOST_PP_SUB(BOOST_PP_LIMIT_MAG,20)) == BOOST_PP_LIMIT_MAG TEST_E
 
 TEST_B BOOST_PP_SUB(11,0) == 11 TEST_E
 TEST_B BOOST_PP_SUB(12,1) == 11 TEST_E