diff --git a/Eigen/src/Core/functors/BinaryFunctors.h b/Eigen/src/Core/functors/BinaryFunctors.h
index 71f894eaf..fc878155a 100644
--- a/Eigen/src/Core/functors/BinaryFunctors.h
+++ b/Eigen/src/Core/functors/BinaryFunctors.h
@@ -206,7 +206,10 @@ struct functor_traits<scalar_cmp_op<LhsScalar,RhsScalar, cmp> > {
   enum {
     Cost = (NumTraits<LhsScalar>::AddCost+NumTraits<RhsScalar>::AddCost)/2,
     PacketAccess = is_same<LhsScalar, RhsScalar>::value &&
-        packet_traits<LhsScalar>::HasCmp
+        packet_traits<LhsScalar>::HasCmp &&
+        // Since return type is bool, we currently require the inputs
+        // to be bool to enable packet access.
+        is_same<LhsScalar, bool>::value
   };
 };