diff --git a/src/libslic3r/Format/STEP.hpp b/src/libslic3r/Format/STEP.hpp
index 4c035e3eba..3253553567 100644
--- a/src/libslic3r/Format/STEP.hpp
+++ b/src/libslic3r/Format/STEP.hpp
@@ -107,7 +107,7 @@ public:
                      double linear_defletion = 0.003,
                      double angle_defletion = 0.5);
 
-    std::atomic<bool> m_stop_mesh;
+    std::atomic<bool> m_stop_mesh{false};
     void update_process(int load_stage, int current, int total, bool& cancel);
 private:
     std::string m_path;
diff --git a/src/slic3r/GUI/StepMeshDialog.cpp b/src/slic3r/GUI/StepMeshDialog.cpp
index 17768504a1..5f74a79b7d 100644
--- a/src/slic3r/GUI/StepMeshDialog.cpp
+++ b/src/slic3r/GUI/StepMeshDialog.cpp
@@ -258,10 +258,9 @@ StepMeshDialog::StepMeshDialog(wxWindow* parent, Slic3r::Step& file, double line
     wxStaticText *mesh_face_number_title = new wxStaticText(this, wxID_ANY, _L("Number of triangular facets") + ": ");
     mesh_face_number_title->SetFont(::Label::Body_14);
     mesh_face_number_title->SetForegroundColour(StateColor::darkModeColorFor(FONT_COLOR));
-    mesh_face_number_text = new wxStaticText(this, wxID_ANY, "0");
+    mesh_face_number_text = new wxStaticText(this, wxID_ANY, _L("Calculating, please wait..."));
     mesh_face_number_text->SetFont(::Label::Body_14);
     mesh_face_number_text->SetForegroundColour(StateColor::darkModeColorFor(FONT_COLOR));
-    mesh_face_number_text->SetMinSize(wxSize(FromDIP(150), -1));
     mesh_face_number_sizer->Add(mesh_face_number_title, 0, wxALIGN_LEFT);
     mesh_face_number_sizer->Add(mesh_face_number_text, 0, wxALIGN_LEFT);
     bSizer->Add(mesh_face_number_sizer, 0, wxEXPAND | wxALL, LEFT_RIGHT_PADING);