diff --git a/Eigen/Core b/Eigen/Core
index af3b4de98..e671f7879 100644
--- a/Eigen/Core
+++ b/Eigen/Core
@@ -3,6 +3,7 @@
 
 #include "CoreDeclarations"
 #include <iostream>
+#include <cstring>
 
 #ifdef EIGEN_VECTORIZE
 // it seems we cannot assume posix_memalign is defined in the stdlib header
diff --git a/Eigen/src/Core/Product.h b/Eigen/src/Core/Product.h
index 8daedcc7d..973dcaa3c 100644
--- a/Eigen/src/Core/Product.h
+++ b/Eigen/src/Core/Product.h
@@ -750,9 +750,9 @@ inline void Product<Lhs,Rhs,ProductMode>::_cacheFriendlyEvalAndAdd(DestDerived&
   RhsCopy rhs(m_rhs);
   ei_cache_friendly_product<Scalar>(
     rows(), cols(), lhs.cols(),
-    _LhsCopy::Flags&RowMajorBit, &(lhs.const_cast_derived().coeffRef(0,0)), lhs.stride(),
-    _RhsCopy::Flags&RowMajorBit, &(rhs.const_cast_derived().coeffRef(0,0)), rhs.stride(),
-    Flags&RowMajorBit, &(res.coeffRef(0,0)), res.stride()
+    _LhsCopy::Flags&RowMajorBit, (const Scalar*)&(lhs.const_cast_derived().coeffRef(0,0)), lhs.stride(),
+    _RhsCopy::Flags&RowMajorBit, (const Scalar*)&(rhs.const_cast_derived().coeffRef(0,0)), rhs.stride(),
+    Flags&RowMajorBit, (Scalar*)&(res.coeffRef(0,0)), res.stride()
   );
 }