diff --git a/unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h b/unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h
index 14a8aef58..68456f579 100644
--- a/unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h
+++ b/unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h
@@ -258,7 +258,7 @@ struct matrix_exp_computeUV<MatrixType, long double>
   {
 #if   LDBL_MANT_DIG == 53   // double precision
   
-    matrix_exp_computeUV<MatrixType, double>::run(arg, U, V, squarings);
+    matrix_exp_computeUV<MatrixType, double>::run(arg.cast<double>(), U.cast<double(), V.cast<doble>(), squarings);
   
 #else