diff --git a/Eigen/src/Geometry/Hyperplane.h b/Eigen/src/Geometry/Hyperplane.h
index 22c530d4b..b1b26062f 100644
--- a/Eigen/src/Geometry/Hyperplane.h
+++ b/Eigen/src/Geometry/Hyperplane.h
@@ -52,9 +52,9 @@ public:
   typedef _Scalar Scalar;
   typedef typename NumTraits<Scalar>::Real RealScalar;
   typedef Matrix<Scalar,AmbientDimAtCompileTime,1> VectorType;
-  typedef Matrix<Scalar,AmbientDimAtCompileTime==Dynamic
+  typedef Matrix<Scalar,int(AmbientDimAtCompileTime)==Dynamic
                         ? Dynamic
-                        : AmbientDimAtCompileTime+1,1> Coefficients;
+                        : int(AmbientDimAtCompileTime)+1,1> Coefficients;
   typedef Block<Coefficients,AmbientDimAtCompileTime,1> NormalReturnType;
 
   /** Default constructor without initialization */