diff --git a/src/libs/antares/utils/include/antares/utils/utils.h b/src/libs/antares/utils/include/antares/utils/utils.h
index e7e293da12..8c73dc53d2 100644
--- a/src/libs/antares/utils/include/antares/utils/utils.h
+++ b/src/libs/antares/utils/include/antares/utils/utils.h
@@ -59,6 +59,7 @@ double round(double d, unsigned precision);
 double ceilDiv(double numerator, double denominator);
 double floorDiv(double numerator, double denominator);
 
+bool checkAllElementsIdenticalOrOne(std::vector<unsigned> w);
 bool checkAllElementsIdenticalOrOne(std::vector<std::pair<unsigned, std::string>>& p);
 
 } // namespace Utils
diff --git a/src/libs/antares/utils/utils.cpp b/src/libs/antares/utils/utils.cpp
index 0ab44cdde1..fec6a07a71 100644
--- a/src/libs/antares/utils/utils.cpp
+++ b/src/libs/antares/utils/utils.cpp
@@ -172,6 +172,12 @@ double floorDiv(double numerator, double denominator)
     return std::floor(std::round(numerator / denominator * largeValue) / largeValue);
 }
 
+bool checkAllElementsIdenticalOrOne(std::vector<unsigned> w)
+{
+    auto first_one = std::remove(w.begin(), w.end(), 1); // Reject all 1 to the end
+    return std::adjacent_find(w.begin(), first_one, std::not_equal_to<uint>()) == first_one;
+}
+
 bool checkAllElementsIdenticalOrOne(std::vector<std::pair<unsigned, std::string>>& p)
 {
     // Reject all 1 to the end
diff --git a/src/solver/simulation/timeseries-numbers.cpp b/src/solver/simulation/timeseries-numbers.cpp
index 1b8e389be5..ca3addc1e3 100644
--- a/src/solver/simulation/timeseries-numbers.cpp
+++ b/src/solver/simulation/timeseries-numbers.cpp
@@ -207,16 +207,12 @@ class IntraModalConsistencyChecker
 bool IntraModalConsistencyChecker::checkTSconsistency()
 {
     logs.info() << "Checking intra-modal correlation: " << tsTitle_;
-    std::vector<std::pair<unsigned, std::string>> listNumberTS;
+    std::vector<unsigned> listNumberTS;
     for (auto i = study_.areas.begin(); i != study_.areas.end(); ++i)
     {
         const Area& area = *(i->second);
-        vector<uint> areaNumberTSList = tsCounter_->getAreaTimeSeriesNumber(area);
-        listNumberTS.reserve(listNumberTS.size() + areaNumberTSList.size());
-        for (const auto& ts: areaNumberTSList)
-        {
-            listNumberTS.push_back({ts, ""});
-        }
+        std::vector<unsigned> areaNumberTSList = tsCounter_->getAreaTimeSeriesNumber(area);
+        listNumberTS.insert(listNumberTS.end(), areaNumberTSList.begin(), areaNumberTSList.end());
     }
 
     if (!Utils::checkAllElementsIdenticalOrOne(listNumberTS))
@@ -226,10 +222,7 @@ bool IntraModalConsistencyChecker::checkTSconsistency()
         return false;
     }
     // At this point, all elements are identical or 1
-    nbTimeseries_ = std::ranges::max_element(listNumberTS,
-                                             [](const auto& a, const auto& b)
-                                             { return a.first < b.first; })
-                      ->first;
+    nbTimeseries_ = *(std::ranges::max_element(listNumberTS));
 
     return true;
 }