diff --git a/include/wx/cppunit.h b/include/wx/cppunit.h
index 6698891991..9944daf9ee 100644
--- a/include/wx/cppunit.h
+++ b/include/wx/cppunit.h
@@ -77,6 +77,12 @@
 #define WXTEST_FAIL_WITH_CONDITION(suiteName, Condition, testMethod) \
     WXTEST_ANY_WITH_CONDITION(suiteName, Condition, testMethod, CPPUNIT_TEST_FAIL(testMethod))
 
+// Use this macro to compare a wxString with a literal string.
+#define WX_ASSERT_STR_EQUAL(p, s) CPPUNIT_ASSERT_EQUAL(wxString(p), s)
+
+// Use this macro to compare a size_t with a literal integer
+#define WX_ASSERT_SIZET_EQUAL(n, m) CPPUNIT_ASSERT_EQUAL(((size_t)n), m)
+
 
 ///////////////////////////////////////////////////////////////////////////////
 // stream inserter for wxString
diff --git a/tests/strings/strings.cpp b/tests/strings/strings.cpp
index 37a7840bba..d3cfd79117 100644
--- a/tests/strings/strings.cpp
+++ b/tests/strings/strings.cpp
@@ -615,7 +615,7 @@ void StringTestCase::WriteBuf()
     CPPUNIT_ASSERT_EQUAL(_T('f'), s[0u]);
     CPPUNIT_ASSERT_EQUAL(_T('o'), s[1]);
     CPPUNIT_ASSERT_EQUAL(_T('o'), s[2]);
-    CPPUNIT_ASSERT_EQUAL(3u, s.length());
+    WX_ASSERT_SIZET_EQUAL(3, s.length());
 
     {
         wxChar *p = s.GetWriteBuf(10);
@@ -626,7 +626,7 @@ void StringTestCase::WriteBuf()
         CPPUNIT_ASSERT_EQUAL(_T('a'), s[1]);
         CPPUNIT_ASSERT_EQUAL(_T('r'), s[2]);
         CPPUNIT_ASSERT_EQUAL(_T('r'), s[3]);
-        CPPUNIT_ASSERT_EQUAL(4u, s.length());
+        WX_ASSERT_SIZET_EQUAL(4, s.length());
 
         CPPUNIT_ASSERT_EQUAL( 0, wxStrcmp(_T("barr"), s) );
     }