diff --git a/Eigen/src/Core/util/ForwardDeclarations.h b/Eigen/src/Core/util/ForwardDeclarations.h
index e384ba2df..c884487b6 100644
--- a/Eigen/src/Core/util/ForwardDeclarations.h
+++ b/Eigen/src/Core/util/ForwardDeclarations.h
@@ -178,7 +178,7 @@ template<typename MatrixType,int Direction> class Homogeneous;
 
 // MatrixFunctions module
 template<typename Derived> struct MatrixExponentialReturnValue;
-template<typename Derived> struct MatrixFunctionReturnValue;
+template<typename Derived> class MatrixFunctionReturnValue;
 template <typename Scalar>
 struct ei_stem_function
 {