diff --git a/src/libslic3r/Flow.cpp b/src/libslic3r/Flow.cpp
index 9ac91c51d4..b367be0226 100644
--- a/src/libslic3r/Flow.cpp
+++ b/src/libslic3r/Flow.cpp
@@ -4,6 +4,7 @@
 #include <cmath>
 #include <assert.h>
 
+#include <boost/algorithm/string/predicate.hpp>
 
 // Mark string for localization and translate.
 #define L(s) Slic3r::I18N::translate(s)
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp b/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp
index e3b18792e9..11a78fd607 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp
@@ -352,8 +352,9 @@ bool GLGizmoHollow::unproject_on_mesh(const Vec2d& mouse_pos, std::pair<Vec3f, V
         // of it and then remove the hole again.
         if (m_c->has_drilled_mesh()) {
             m_c->m_model_object->sla_drain_holes.push_back(sla::DrainHole());
+            m_selected.push_back(false);
             m_parent.post_event(SimpleEvent(EVT_GLCANVAS_FORCE_UPDATE));
-            wxGetApp().CallAfter([this] { m_c->m_model_object->sla_drain_holes.pop_back();});
+            wxGetApp().CallAfter([this] { m_c->m_model_object->sla_drain_holes.pop_back(); m_selected.pop_back(); });
             return false;
         }
 
@@ -667,6 +668,7 @@ void GLGizmoHollow::on_render_input_window(float x, float y, float bottom_limit)
 
     bool first_run = true; // This is a hack to redraw the button when all points are removed,
                            // so it is not delayed until the background process finishes.
+
 RENDER_AGAIN:
     const float approx_height = m_imgui->scaled(20.0f);
     y = std::min(y, bottom_limit - approx_height);
@@ -692,6 +694,8 @@ RENDER_AGAIN:
 
     if (m_imgui->button(m_desc["preview"]))
         hollow_mesh();
+    
+    bool config_changed = false;
 
     ImGui::Separator();
 
@@ -701,6 +705,7 @@ RENDER_AGAIN:
         if (m_imgui->checkbox(m_desc["enable"], m_enable_hollowing)) {
             m_c->m_model_object->config.opt<ConfigOptionBool>("hollowing_enable", true)->value = m_enable_hollowing;
             wxGetApp().obj_list()->update_and_show_object_settings_item();
+            config_changed = true;
         }
     }
 
@@ -776,8 +781,10 @@ RENDER_AGAIN:
         m_c->m_model_object->config.opt<ConfigOptionFloat>("hollowing_min_thickness", true)->value = offset;
         m_c->m_model_object->config.opt<ConfigOptionFloat>("hollowing_quality", true)->value = quality;
         m_c->m_model_object->config.opt<ConfigOptionFloat>("hollowing_closing_distance", true)->value = closing_d;
-        if (slider_released)
+        if (slider_released) {
             wxGetApp().obj_list()->update_and_show_object_settings_item();
+            config_changed = true;
+        }
     }
 
     m_imgui->disabled_end();
@@ -902,6 +909,9 @@ RENDER_AGAIN:
 
     if (force_refresh)
         m_parent.set_as_dirty();
+    
+    if (config_changed)
+        m_parent.post_event(SimpleEvent(EVT_GLCANVAS_FORCE_UPDATE));
 }
 
 bool GLGizmoHollow::on_is_activable() const