diff --git a/Eigen/src/Core/Assign.h b/Eigen/src/Core/Assign.h
index bcfc261e5..f48173172 100644
--- a/Eigen/src/Core/Assign.h
+++ b/Eigen/src/Core/Assign.h
@@ -449,7 +449,7 @@ struct assign_impl<Derived1, Derived2, SliceVectorizedTraversal, NoUnrolling, Ve
       srcAlignment = assign_traits<Derived1,Derived2>::JointAlignment
     };
     const Scalar *dst_ptr = &dst.coeffRef(0,0);
-    if((!bool(dstIsAligned)) && (Index(dst_ptr) % sizeof(Scalar))>0)
+    if((!bool(dstIsAligned)) && (size_t(dst_ptr) % sizeof(Scalar))>0)
     {
       // the pointer is not aligend-on scalar, so alignment is not possible
       return assign_impl<Derived1,Derived2,DefaultTraversal,NoUnrolling>::run(dst, src);