diff --git a/Eigen/src/Core/Visitor.h b/Eigen/src/Core/Visitor.h
index 9116b9512..d6efb0495 100644
--- a/Eigen/src/Core/Visitor.h
+++ b/Eigen/src/Core/Visitor.h
@@ -86,11 +86,11 @@ template<typename Derived>
 template<typename Visitor>
 void DenseBase<Derived>::visit(Visitor& visitor) const
 {
-  const bool unroll = SizeAtCompileTime != Dynamic
+  enum { unroll = SizeAtCompileTime != Dynamic
                    && CoeffReadCost != Dynamic
                    && (SizeAtCompileTime == 1 || ei_functor_traits<Visitor>::Cost != Dynamic)
                    && SizeAtCompileTime * CoeffReadCost + (SizeAtCompileTime-1) * ei_functor_traits<Visitor>::Cost
-                      <= EIGEN_UNROLLING_LIMIT;
+                      <= EIGEN_UNROLLING_LIMIT };
   return ei_visitor_impl<Visitor, Derived,
       unroll ? int(SizeAtCompileTime) : Dynamic
     >::run(derived(), visitor);