diff --git a/tests/datetime/datetimetest.cpp b/tests/datetime/datetimetest.cpp
index 9883d875c9..9917d15c99 100644
--- a/tests/datetime/datetimetest.cpp
+++ b/tests/datetime/datetimetest.cpp
@@ -1449,6 +1449,8 @@ void DateTimeTestCase::TestDateOnly()
     CPPUNIT_ASSERT_EQUAL( wxDateTime::Today(), wxDateTime::Now().GetDateOnly() );
 }
 
+#if defined(__WINDOWS__) || defined(__WXOSX__)
+
 // This function is defined in src/common/intl.cpp and as it is not public we
 // need to declare it here explicitly.
 WXDLLIMPEXP_BASE
@@ -1484,4 +1486,6 @@ void DateTimeTestCase::TestTranslateFromUnicodeFormat()
         wxTranslateFromUnicodeFormat("''H 'o''clock: It''s about time'''"));
 }
 
+#endif // ports having wxTranslateFromUnicodeFormat()
+
 #endif // wxUSE_DATETIME