diff --git a/core/base/batch_multi_vector.cpp b/core/base/batch_multi_vector.cpp
index 6796b77e932..88a203300de 100644
--- a/core/base/batch_multi_vector.cpp
+++ b/core/base/batch_multi_vector.cpp
@@ -368,7 +368,7 @@ void read_impl(MatrixType* mtx, const std::vector<MatrixData>& data)
     auto tmp =
         MatrixType::create(mtx->get_executor()->get_master(), batch_size);
     for (size_type b = 0; b < num_batch_items; ++b) {
-        assert(data[b].size() == common_size);
+        assert(data[b].size == common_size);
         tmp->create_view_for_item(b)->read(data[b]);
     }
 
diff --git a/include/ginkgo/core/base/batch_multi_vector.hpp b/include/ginkgo/core/base/batch_multi_vector.hpp
index 206b3c23723..77171569320 100644
--- a/include/ginkgo/core/base/batch_multi_vector.hpp
+++ b/include/ginkgo/core/base/batch_multi_vector.hpp
@@ -226,8 +226,8 @@ class MultiVector
      *       significantly more memory efficient than the non-constant version,
      *       so always prefer this version.
      */
-    const value_type* get_const_values_for_item(
-        size_type batch_id) const noexcept
+    const value_type* get_const_values_for_item(size_type batch_id) const
+        noexcept
     {
         GKO_ASSERT(batch_id < this->get_num_batch_items());
         return values_.get_const_data() +