diff --git a/client.cpp b/client.cpp
index 5ea2286582..4fe24e6f6d 100644
--- a/client.cpp
+++ b/client.cpp
@@ -214,7 +214,7 @@ void Client::releaseWindow(bool on_shutdown)
     deleting = true;
 #ifdef KWIN_BUILD_TABBOX
     TabBox::TabBox *tabBox = TabBox::TabBox::self();
-    if (tabBox && tabBox->isDisplayed() && tabBox->currentClient() == this) {
+    if (tabBox->isDisplayed() && tabBox->currentClient() == this) {
         tabBox->nextPrev(true);
     }
 #endif
diff --git a/workspace.cpp b/workspace.cpp
index 8dbf5e6295..d63b666e14 100644
--- a/workspace.cpp
+++ b/workspace.cpp
@@ -1792,7 +1792,7 @@ void Workspace::updateTabbox()
 {
 #ifdef KWIN_BUILD_TABBOX
     TabBox::TabBox *tabBox = TabBox::TabBox::self();
-    if (tabBox && tabBox->isDisplayed()) {
+    if (tabBox->isDisplayed()) {
         tabBox->reset(true);
     }
 #endif
diff --git a/xdgshellclient.cpp b/xdgshellclient.cpp
index 9313d854fe..f202a9e53b 100644
--- a/xdgshellclient.cpp
+++ b/xdgshellclient.cpp
@@ -374,7 +374,7 @@ void XdgShellClient::destroyClient()
     m_closing = true;
 #ifdef KWIN_BUILD_TABBOX
     TabBox::TabBox *tabBox = TabBox::TabBox::self();
-    if (tabBox && tabBox->isDisplayed() && tabBox->currentClient() == this) {
+    if (tabBox->isDisplayed() && tabBox->currentClient() == this) {
         tabBox->nextPrev(true);
     }
 #endif