diff --git a/test/bit_rotate_test.cpp b/test/bit_rotate_test.cpp
index 51bc154..d37569e 100644
--- a/test/bit_rotate_test.cpp
+++ b/test/bit_rotate_test.cpp
@@ -103,26 +103,28 @@ int main()
         BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x44444444 );
     }
 
+#define CONST64(x) ((boost::uint64_t(x) << 32) + (x))
+
     {
-        boost::uint64_t x = 0x1111111111111111;
+        boost::uint64_t x = CONST64(0x11111111);
 
-        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x2222222222222222 );
-        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x8888888888888888 );
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), CONST64(0x22222222) );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), CONST64(0x88888888) );
 
-        x = 0x2222222222222222;
+        x = CONST64(0x22222222);
 
-        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x4444444444444444 );
-        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x1111111111111111 );
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), CONST64(0x44444444) );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), CONST64(0x11111111) );
 
-        x = 0x4444444444444444;
+        x = CONST64(0x44444444);
 
-        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x8888888888888888 );
-        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x2222222222222222 );
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), CONST64(0x88888888) );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), CONST64(0x22222222) );
 
-        x = 0x8888888888888888;
+        x = CONST64(0x88888888);
 
-        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), 0x1111111111111111 );
-        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), 0x4444444444444444 );
+        BOOST_TEST_EQ( +boost::core::rotl( x, 1 ), CONST64(0x11111111) );
+        BOOST_TEST_EQ( +boost::core::rotr( x, 1 ), CONST64(0x44444444) );
     }
 
     for( int i = -M; i <= M; ++i )