diff --git a/contrib/epee/include/serialization/keyvalue_serialization.h b/contrib/epee/include/serialization/keyvalue_serialization.h
index 31a4fb8b..31c90df7 100644
--- a/contrib/epee/include/serialization/keyvalue_serialization.h
+++ b/contrib/epee/include/serialization/keyvalue_serialization.h
@@ -115,7 +115,7 @@ public: \
     template<t_uint mask>
     inline static bool get_value_of_flag_by_mask(const t_uint& given_flags)
     { 
-      return given_flags&mask == 0 ? false : true;
+      return (given_flags&mask) == 0 ? false : true;
     }
   };