diff --git a/include/wx/hashmap.h b/include/wx/hashmap.h
index b2aa1bff1a..cbf9fec263 100644
--- a/include/wx/hashmap.h
+++ b/include/wx/hashmap.h
@@ -640,7 +640,7 @@ public: \
  \
     /* count() == 0 | 1 */ \
     size_type count( const const_key_type& key ) \
-        { return GetNode( key ) ? 1 : 0; } \
+        { return GetNode( key ) ? 1u : 0u; } \
 }
 
 #endif // !wxUSE_STL || !defined(HAVE_STL_HASH_MAP)