diff --git a/Eigen/src/Core/NumTraits.h b/Eigen/src/Core/NumTraits.h
index 76bf8a58f..70ea7ef9e 100644
--- a/Eigen/src/Core/NumTraits.h
+++ b/Eigen/src/Core/NumTraits.h
@@ -113,7 +113,7 @@ template<typename _Real> struct NumTraits<std::complex<_Real> >
   typedef _Real Real;
   enum {
     IsComplex = 1,
-    ReadCost = 2,
+    ReadCost = 2 * NumTraits<_Real>::ReadCost,
     AddCost = 2 * NumTraits<Real>::AddCost,
     MulCost = 4 * NumTraits<Real>::MulCost + 2 * NumTraits<Real>::AddCost
   };