diff --git a/eigenlib/Eigen/src/Core/Transpose.h b/eigenlib/Eigen/src/Core/Transpose.h
index 045a1cce..d82ee5aa 100644
--- a/eigenlib/Eigen/src/Core/Transpose.h
+++ b/eigenlib/Eigen/src/Core/Transpose.h
@@ -353,7 +353,7 @@ struct check_transpose_aliasing_run_time_selector
 {
   static bool run(const Scalar* dest, const OtherDerived& src)
   {
-    return (bool(blas_traits<OtherDerived>::IsTransposed) != DestIsTransposed) && (dest!=0 && dest==(Scalar*)extract_data(src));
+    return (bool(blas_traits<OtherDerived>::IsTransposed) != DestIsTransposed) && (dest!=0 && dest==(const Scalar*)extract_data(src));
   }
 };