diff --git a/src/libs/antares/study/parts/common/cluster_list.cpp b/src/libs/antares/study/parts/common/cluster_list.cpp
index 2551c507cf..0feee3a77f 100644
--- a/src/libs/antares/study/parts/common/cluster_list.cpp
+++ b/src/libs/antares/study/parts/common/cluster_list.cpp
@@ -96,7 +96,8 @@ void ClusterList<ClusterT>::storeTimeseriesNumbers(Solver::IResultWriter& writer
 
     for (auto& cluster: each_enabled())
     {
-        fs::path path = fs::path(cluster->parentArea->id) / std::string(cluster->id() + ".txt");
+        fs::path path = fs::path(cluster->parentArea->id.c_str())
+                        / std::string(cluster->id() + ".txt");
 
         ts_content.clear(); // We must clear ts_content here, since saveToBuffer does not do it.
         cluster->series.timeseriesNumbers.saveToBuffer(ts_content);
diff --git a/src/solver/simulation/opt_time_writer.cpp b/src/solver/simulation/opt_time_writer.cpp
index a09f3feaa8..8ea4091a26 100644
--- a/src/solver/simulation/opt_time_writer.cpp
+++ b/src/solver/simulation/opt_time_writer.cpp
@@ -47,5 +47,5 @@ void OptimizationStatisticsWriter::finalize()
     const path filename = path("optimization") / "week-by-week"
                           / ("year_" + std::to_string(pYear) + ".txt");
     std::string s = pBuffer.str();
-    pWriter.addEntryFromBuffer(filename.string(), s);
+    pWriter.addEntryFromBuffer(filename, s);
 }