diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index ee1db4802..407d57030 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -4721,7 +4721,7 @@ bool GLCanvas3D::_init_undoredo_toolbar()
         std::string curr_additional_tooltip;
         m_undoredo_toolbar.get_additional_tooltip(id, curr_additional_tooltip);
 
-        std::string new_additional_tooltip = "";
+        std::string new_additional_tooltip;
         if (can_undo) {
         	std::string action;
             wxGetApp().plater()->undo_redo_topmost_string_getter(true, action);
@@ -4759,7 +4759,7 @@ bool GLCanvas3D::_init_undoredo_toolbar()
         std::string curr_additional_tooltip;
         m_undoredo_toolbar.get_additional_tooltip(id, curr_additional_tooltip);
 
-        std::string new_additional_tooltip = "";
+        std::string new_additional_tooltip;
         if (can_redo) {
         	std::string action;
             wxGetApp().plater()->undo_redo_topmost_string_getter(false, action);
diff --git a/src/slic3r/GUI/Gizmos/GLGizmosManager.cpp b/src/slic3r/GUI/Gizmos/GLGizmosManager.cpp
index 01b88d3d1..514db73c0 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmosManager.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmosManager.cpp
@@ -653,7 +653,7 @@ bool GLGizmosManager::on_mouse(wxMouseEvent& evt)
 
     if (get_gizmo_idx_from_mouse(mouse_pos) == Undefined) {
         // mouse is outside the toolbar
-        m_tooltip = "";
+        m_tooltip.clear();
 
         if (evt.LeftDown() && (!control_down || grabber_contains_mouse())) {
             if ((m_current == SlaSupports || m_current == Hollow || m_current == FdmSupports || m_current == Seam || m_current == MmuSegmentation)
diff --git a/src/slic3r/GUI/ImGuiWrapper.hpp b/src/slic3r/GUI/ImGuiWrapper.hpp
index c60ac3776..590ef95b0 100644
--- a/src/slic3r/GUI/ImGuiWrapper.hpp
+++ b/src/slic3r/GUI/ImGuiWrapper.hpp
@@ -97,9 +97,9 @@ public:
     // Float sliders: Manually inserted values aren't clamped by ImGui.Using this wrapper function does (when clamp==true).
 #if ENABLE_ENHANCED_IMGUI_SLIDER_FLOAT
     ImVec2 get_slider_icon_size() const;
-    bool slider_float(const char* label, float* v, float v_min, float v_max, const char* format = "%.3f", float power = 1.0f, bool clamp = true, const wxString& tooltip = "", bool show_edit_btn = true);
-    bool slider_float(const std::string& label, float* v, float v_min, float v_max, const char* format = "%.3f", float power = 1.0f, bool clamp = true, const wxString& tooltip = "", bool show_edit_btn = true);
-    bool slider_float(const wxString& label, float* v, float v_min, float v_max, const char* format = "%.3f", float power = 1.0f, bool clamp = true, const wxString& tooltip = "", bool show_edit_btn = true);
+    bool slider_float(const char* label, float* v, float v_min, float v_max, const char* format = "%.3f", float power = 1.0f, bool clamp = true, const wxString& tooltip = {}, bool show_edit_btn = true);
+    bool slider_float(const std::string& label, float* v, float v_min, float v_max, const char* format = "%.3f", float power = 1.0f, bool clamp = true, const wxString& tooltip = {}, bool show_edit_btn = true);
+    bool slider_float(const wxString& label, float* v, float v_min, float v_max, const char* format = "%.3f", float power = 1.0f, bool clamp = true, const wxString& tooltip = {}, bool show_edit_btn = true);
 #else
     bool slider_float(const char* label, float* v, float v_min, float v_max, const char* format = "%.3f", float power = 1.0f, bool clamp = true);
     bool slider_float(const std::string& label, float* v, float v_min, float v_max, const char* format = "%.3f", float power = 1.0f, bool clamp = true);
diff --git a/src/slic3r/GUI/PresetComboBoxes.cpp b/src/slic3r/GUI/PresetComboBoxes.cpp
index 7b9c9846c..2b53883be 100644
--- a/src/slic3r/GUI/PresetComboBoxes.cpp
+++ b/src/slic3r/GUI/PresetComboBoxes.cpp
@@ -786,8 +786,8 @@ void PlaterPresetComboBox::update()
 
     std::map<wxString, wxBitmap*> nonsys_presets;
 
-    wxString selected_user_preset = "";
-    wxString tooltip = "";
+    wxString selected_user_preset;
+    wxString tooltip;
     const std::deque<Preset>& presets = m_collection->get_presets();
 
     if (!presets.front().is_visible)