diff --git a/src/Core/Eval.h b/src/Core/Eval.h
index 48787476a..b90018e05 100644
--- a/src/Core/Eval.h
+++ b/src/Core/Eval.h
@@ -26,10 +26,10 @@
 #ifndef EIGEN_EVAL_H
 #define EIGEN_EVAL_H
 
-template<typename Expression> class Eval
-  : public Matrix< typename Expression::Scalar,
-                     Expression::RowsAtCompileTime,
-                     Expression::ColsAtCompileTime >
+template<typename Expression> class Eval : NoOperatorEquals,
+  public Matrix< typename Expression::Scalar,
+                 Expression::RowsAtCompileTime,
+                 Expression::ColsAtCompileTime >
 {
   public:
     typedef typename Expression::Scalar Scalar;
@@ -37,8 +37,6 @@ template<typename Expression> class Eval
     typedef Expression Base;
     friend class MatrixBase<Scalar, Expression>;
     
-    EIGEN_INHERIT_ASSIGNMENT_OPERATORS(Eval)
-    
     Eval(const Expression& expression) : MatrixType(expression) {}
 };