diff --git a/Eigen/src/Core/util/ForwardDeclarations.h b/Eigen/src/Core/util/ForwardDeclarations.h
index 9debb9409..b3bc9c161 100644
--- a/Eigen/src/Core/util/ForwardDeclarations.h
+++ b/Eigen/src/Core/util/ForwardDeclarations.h
@@ -35,7 +35,7 @@ template<typename Derived> struct ei_has_direct_access
 };
 
 template<typename Derived> struct EigenBase;
-template<typename Derived> struct DenseBase;
+template<typename Derived> class DenseBase;
 template<typename Derived, bool EnableDirectAccessAPI = ei_has_direct_access<Derived>::ret>
 class DenseCoeffsBase;