diff --git a/include/ginkgo/core/base/lin_op.hpp b/include/ginkgo/core/base/lin_op.hpp
index 079006d8f19..d53df7e8af2 100644
--- a/include/ginkgo/core/base/lin_op.hpp
+++ b/include/ginkgo/core/base/lin_op.hpp
@@ -864,23 +864,23 @@ class EnableValueTypedLinOp
         return this->apply(alpha, b, dense_beta.get(), x);
     }
 
-    const ConcreteLinOp *apply(const ValueType alpha, const LinOp *b,
-                               const ValueType beta, LinOp *x)
+    ConcreteLinOp *apply(const ValueType alpha, const LinOp *b,
+                         const ValueType beta, LinOp *x)
     {
         auto dense_alpha = scalar_to_dense(alpha, this->get_executor());
         auto dense_beta = scalar_to_dense(beta, this->get_executor());
         return this->apply(dense_alpha.get(), b, dense_beta.get(), x);
     }
 
-    const ConcreteLinOp *apply(const ValueType alpha, const LinOp *b,
-                               const LinOp *beta, LinOp *x)
+    ConcreteLinOp *apply(const ValueType alpha, const LinOp *b,
+                         const LinOp *beta, LinOp *x)
     {
         auto dense_alpha = scalar_to_dense(alpha, this->get_executor());
         return this->apply(dense_alpha.get(), b, beta, x);
     }
 
-    const ConcreteLinOp *apply(const LinOp *alpha, const LinOp *b,
-                               const ValueType beta, LinOp *x)
+    ConcreteLinOp *apply(const LinOp *alpha, const LinOp *b,
+                         const ValueType beta, LinOp *x)
     {
         auto dense_beta = scalar_to_dense(beta, this->get_executor());
         return this->apply(alpha, b, dense_beta.get(), x);