diff --git a/utils/debugUtils/MFEMAnalysisUtils/MFEMAnalysis-cpp/src/include/mfem_smout.h b/utils/debugUtils/MFEMAnalysisUtils/MFEMAnalysis-cpp/src/include/mfem_smout.h
index 12d1ab5..84e5c27 100644
--- a/utils/debugUtils/MFEMAnalysisUtils/MFEMAnalysis-cpp/src/include/mfem_smout.h
+++ b/utils/debugUtils/MFEMAnalysisUtils/MFEMAnalysis-cpp/src/include/mfem_smout.h
@@ -196,7 +196,7 @@ inline void writeOperatorToCSV(const mfem::Operator &op,
     writeDenseMatrixToCSV(filename, precision, mat);
 }
 
-inline void saveBlockFormToBinary(const std::vector<mfem::Operator*> &block_diags, const std::vector<std::array<int, 2>>& block, const std::vector<bool> neg, const std::string &filename) {
+inline void saveBlockFormToBinary(const std::vector<mfem::Operator*> &block_diags, const std::vector<std::array<int, 2>>& block, const std::vector<bool>& neg, const std::string &filename) {
     // First write a magic number and version
 
     // --- Open the file ---