diff --git a/src/wm/window.ts b/src/wm/window.ts
index dd6042c..b1cca33 100644
--- a/src/wm/window.ts
+++ b/src/wm/window.ts
@@ -47,6 +47,10 @@ export class WindowWrapper {
         return this._window.get_frame_rect();
     }
 
+    isFullscreen(): boolean {
+        return this._window.is_fullscreen();
+    }
+
     getTabLabel(): string {
         const rawAppName = this._window.get_wm_class() ?? '';
         // Strip reverse-domain prefix (e.g. "org.gnome.Nautilus" -> "Nautilus")
@@ -140,6 +144,11 @@ export class WindowWrapper {
             return;
         }
 
+        if (this.isFullscreen()) {
+            Logger.info("STOPPED RESIZE BECAUSE WINDOW IS FULLSCREEN");
+            return;
+        }
+
         const actor = this._window.get_compositor_private() as Clutter.Actor | null;
         if (!actor) {
             Logger.log("No actor available, can't resize safely yet");