diff --git a/include/fc/optional.hpp b/include/fc/optional.hpp
index 9c811a2..dfb725d 100644
--- a/include/fc/optional.hpp
+++ b/include/fc/optional.hpp
@@ -236,7 +236,7 @@ namespace fc {
       const T* ptr()const { const void* v = &_value[0]; return static_cast<const T*>(v); }
 
       // force alignment... to 8 byte boundaries 
-      double _value[8 * ((sizeof(T)+7)/8)];
+      double _value[((sizeof(T)+7)/8)];
       bool   _valid;
   };