diff --git a/alib2std/test-src/extensions/SetTest.cpp b/alib2std/test-src/extensions/SetTest.cpp
index 15ffd03fe0954887cf73e342c66d5f9f4ffb0c10..eb91b100e8ac3700b852a68e50a32ed53a31e487 100644
--- a/alib2std/test-src/extensions/SetTest.cpp
+++ b/alib2std/test-src/extensions/SetTest.cpp
@@ -39,8 +39,8 @@ void SetTest::test2() {
 	std::set_difference (first.begin(), first.end(), second.begin(), second.end(), std::inserter(firstMinusSecond, firstMinusSecond.end()));
 	std::set_difference (second.begin(), second.end(), first.begin(), first.end(), std::inserter(secondMinusFirst, secondMinusFirst.end()));
 
-	CPPUNIT_ASSERT_EQUAL(firstMinusSecond.size(), 0ul);
-	CPPUNIT_ASSERT_EQUAL(secondMinusFirst.size(), 2ul);
+	CPPUNIT_ASSERT_EQUAL(firstMinusSecond.size(), (size_t) 0u);
+	CPPUNIT_ASSERT_EQUAL(secondMinusFirst.size(), (size_t) 2u);
 }
 
 void SetTest::test3() {