diff --git a/shadow.cpp b/shadow.cpp
--- a/shadow.cpp
+++ b/shadow.cpp
@@ -331,12 +331,12 @@
 
 bool Shadow::updateShadow()
 {
-    auto clear = [this] {
-        if (m_topLevel && m_topLevel->shadow()) {
-            auto w = m_topLevel->effectWindow();
+    auto clear = [topLevel = m_topLevel] {
+        if (topLevel && topLevel->shadow()) {
+            auto w = topLevel->effectWindow();
             // this also deletes the shadow
             w->sceneWindow()->updateShadow(nullptr);
-            emit m_topLevel->shadowChanged();
+            emit topLevel->shadowChanged();
         }
     };