diff --git a/netwerk/wifi/osx_corewlan.mm b/netwerk/wifi/osx_corewlan.mm
index 67b18bded207..e3cc86be84e0 100644
--- a/netwerk/wifi/osx_corewlan.mm
+++ b/netwerk/wifi/osx_corewlan.mm
@@ -95,7 +95,7 @@ GetAccessPointsFromWLAN(nsCOMArray<nsWifiAccessPoint> &accessPoints)
       accessPoints.AppendObject(ap);
     }
   }
-  @catch(NSException *_exn) {
+  @catch(NSException*) {
     [pool release];
     return NS_ERROR_NOT_AVAILABLE;
   }