diff --git a/src/extern/kwin.d.ts b/src/extern/kwin.d.ts
index 3eca53d..43dab82 100644
--- a/src/extern/kwin.d.ts
+++ b/src/extern/kwin.d.ts
@@ -62,6 +62,7 @@ interface KwinClient {
     readonly dock: boolean;
     readonly normalWindow: boolean;
     readonly managed: boolean;
+    readonly popupWindow: boolean;
 
     fullScreen: boolean;
     activities: string[]; // empty array means all activities
diff --git a/src/world/Clients.ts b/src/world/Clients.ts
index 1724dd7..8aec85c 100644
--- a/src/world/Clients.ts
+++ b/src/world/Clients.ts
@@ -1,6 +1,6 @@
 namespace Clients {
     export function canTileEver(kwinClient: KwinClient) {
-        return kwinClient.resizeable;
+        return kwinClient.resizeable && !kwinClient.popupWindow;
     }
 
     export function canTileNow(kwinClient: KwinClient) {