diff --git a/Applications/FileIO/Legacy/OGSIOVer4.cpp b/Applications/FileIO/Legacy/OGSIOVer4.cpp
index b23d1f9322ec597f060035278beffa8e7110dc94..cfd58b39a8d83816a0c7f20185095b66f35441ef 100644
--- a/Applications/FileIO/Legacy/OGSIOVer4.cpp
+++ b/Applications/FileIO/Legacy/OGSIOVer4.cpp
@@ -818,7 +818,7 @@ void writeAllDataToGLIFileV4(const std::string& fname,
 
     // writing surfaces as TIN files
     std::size_t sfcs_cnt(0);
-    for (auto& geo_name : geo_names)
+    for (auto const& geo_name : geo_names)
     {
         const GeoLib::SurfaceVec* sfcs_vec(geo.getSurfaceVecObj(geo_name));
         if (sfcs_vec)