--- a/devtools/client/performance-new/panel.js
+++ b/devtools/client/performance-new/panel.js
@@ -40,17 +40,17 @@ class PerformancePanel {
   }
 
   // DevToolPanel API:
 
   get target() {
     return this.toolbox.target;
   }
 
-  async destroy() {
+  destroy() {
     // Make sure this panel is not already destroyed.
     if (this._destroyed) {
       return;
     }
     this.panelWin.gDestroy();
     this.emit("destroyed");
     this._destroyed = true;
   }