diff --git a/libsrc/meshing/meshfunc.cpp b/libsrc/meshing/meshfunc.cpp
index c1a23880..656f6ed8 100644
--- a/libsrc/meshing/meshfunc.cpp
+++ b/libsrc/meshing/meshfunc.cpp
@@ -662,7 +662,7 @@ namespace netgen
     bool do_split = mp.optimize3d.find('d') != string::npos;
     bool do_swap = mp.optimize3d.find('s') != string::npos;
     bool do_swap2 = mp.optimize3d.find('t') != string::npos;
-    for(auto i : Range(mp.optsteps3d))
+    for([[maybe_unused]] auto i : Range(mp.optsteps3d))
       {
         auto [total_badness, max_badness, bad_els] = optmesh.UpdateBadness();
         if(bad_els==0) break;
diff --git a/libsrc/occ/occ_utils.cpp b/libsrc/occ/occ_utils.cpp
index 0b97f6e7..243349fc 100644
--- a/libsrc/occ/occ_utils.cpp
+++ b/libsrc/occ/occ_utils.cpp
@@ -61,7 +61,7 @@ namespace netgen
     Standard_Integer BuildTriangulation( const TopoDS_Shape & shape )
     {
        BRepTools::Clean (shape);
-       double deflection = 0.01;
+       // double deflection = 0.01;
 
        // https://dev.opencascade.org/doc/overview/html/occt_user_guides__mesh.html
        // from Standard_Boolean meshing_imeshtools_parameters()
diff --git a/libsrc/occ/python_occ_shapes.cpp b/libsrc/occ/python_occ_shapes.cpp
index 967bbba9..e2c819d1 100644
--- a/libsrc/occ/python_occ_shapes.cpp
+++ b/libsrc/occ/python_occ_shapes.cpp
@@ -1262,7 +1262,7 @@ DLL_HEADER void ExportNgOCCShapes(py::module &m)
          })
     .def("_webgui_data", [](const TopoDS_Shape & shape)
          {
-           auto status = BuildTriangulation(shape);
+           [[maybe_unused]] auto status = BuildTriangulation(shape);
            // cout << "status = " << aStatus << endl;
            
            std::vector<double> p[3];
diff --git a/libsrc/visualization/mvdraw.hpp b/libsrc/visualization/mvdraw.hpp
index 687c7750..c1cf63f8 100644
--- a/libsrc/visualization/mvdraw.hpp
+++ b/libsrc/visualization/mvdraw.hpp
@@ -145,16 +145,16 @@ namespace netgen
     int filledtimestamp = -1;
     int linetimestamp = -1;
     int edgetimestamp = -1;
-    int pointnumbertimestamp = -1;
+    // int pointnumbertimestamp = -1;
 
     int tettimestamp = -1;
     int prismtimestamp = -1;
     int pyramidtimestamp = -1;
     int hextimestamp = -1;
 
-    int badeltimestamp = -1;
-    int identifiedtimestamp = -1;
-    int domainsurftimestamp = -1;
+    // int badeltimestamp = -1;
+    // int identifiedtimestamp = -1;
+    // int domainsurftimestamp = -1;
 
     struct {
       unsigned texture = -1;