diff --git a/src/slic3r/GUI/GLCanvas3D.hpp b/src/slic3r/GUI/GLCanvas3D.hpp
index 4591da29f0..92819136a7 100644
--- a/src/slic3r/GUI/GLCanvas3D.hpp
+++ b/src/slic3r/GUI/GLCanvas3D.hpp
@@ -812,6 +812,7 @@ public:
     
     void schedule_extra_frame(int miliseconds);
 
+    float get_main_toolbar_height() { return m_main_toolbar.get_height(); }
     int get_main_toolbar_item_id(const std::string& name) const { return m_main_toolbar.get_item_id(name); }
     void force_main_toolbar_left_action(int item_id) { m_main_toolbar.force_left_action(item_id, *this); }
     void force_main_toolbar_right_action(int item_id) { m_main_toolbar.force_right_action(item_id, *this); }
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoSimplify.cpp b/src/slic3r/GUI/Gizmos/GLGizmoSimplify.cpp
index 90b601a9dd..133803441f 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoSimplify.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoSimplify.cpp
@@ -200,7 +200,7 @@ void GLGizmoSimplify::on_render_input_window(float x, float y, float bottom_limi
             pos.x -= m_gui_cfg->window_offset_x;
             pos.y -= m_gui_cfg->window_offset_y;
             // minimal top left value
-            ImVec2 tl(m_gui_cfg->window_padding, m_gui_cfg->window_padding);
+            ImVec2 tl(m_gui_cfg->window_padding, m_gui_cfg->window_padding + m_parent.get_main_toolbar_height());
             if (pos.x < tl.x) pos.x = tl.x;
             if (pos.y < tl.y) pos.y = tl.y;
             // maximal bottom right value