diff --git a/src/common/ustring.cpp b/src/common/ustring.cpp
index cb7eb084c4..b3176323ee 100644
--- a/src/common/ustring.cpp
+++ b/src/common/ustring.cpp
@@ -545,4 +545,16 @@ wxU16CharBuffer wxUString::utf16_str() const
     
     return result;    
 }
-    
+
+
+#if SIZEOF_WCHAR_T != 2
+template<>
+wxCharTypeBuffer<wxChar16>::Data
+wxCharTypeBuffer<wxChar16>::NullData(NULL);
+#endif
+
+#if SIZEOF_WCHAR_T != 4
+template<>
+wxCharTypeBuffer<wxChar32>::Data
+wxCharTypeBuffer<wxChar32>::NullData(NULL);
+#endif