diff --git a/test/hash_complex_test.cpp b/test/hash_complex_test.cpp
index 73f43de..f9a7bc8 100644
--- a/test/hash_complex_test.cpp
+++ b/test/hash_complex_test.cpp
@@ -101,7 +101,7 @@ template<class T> void complex_grid_test( short N )
         }
     }
 
-    BOOST_TEST_EQ( hashes.size(), N * N );
+    BOOST_TEST_EQ( hashes.size(), static_cast<std::size_t>( N * N ) );
 }
 
 int main()
diff --git a/test/hash_number_test.cpp b/test/hash_number_test.cpp
index 668a86c..a463498 100644
--- a/test/hash_number_test.cpp
+++ b/test/hash_number_test.cpp
@@ -103,10 +103,8 @@ void limits_test(T*)
 
         if (limits::is_integer)
         {
-            BOOST_TEST(BOOST_HASH_TEST_NAMESPACE::hash_value(min_value)
-                    == std::size_t(min_value));
-            BOOST_TEST(BOOST_HASH_TEST_NAMESPACE::hash_value(max_value)
-                    == std::size_t(max_value));
+            BOOST_TEST_EQ(BOOST_HASH_TEST_NAMESPACE::hash_value(min_value), std::size_t(min_value));
+            BOOST_TEST_EQ(BOOST_HASH_TEST_NAMESPACE::hash_value(max_value), std::size_t(max_value));
         }
 #endif
     }
diff --git a/test/hash_number_test2.cpp b/test/hash_number_test2.cpp
index 324a24b..64373e7 100644
--- a/test/hash_number_test2.cpp
+++ b/test/hash_number_test2.cpp
@@ -29,7 +29,7 @@ void collision_test_()
         hashes.insert( boost::hash<T>()( i * M ) );
     }
 
-    BOOST_TEST_EQ( hashes.size(), 256 );
+    BOOST_TEST_EQ( hashes.size(), 256u );
 }
 
 template <class T>