diff --git a/testing/specialpowers/content/SpecialPowersParent.jsm b/testing/specialpowers/content/SpecialPowersParent.jsm
index b95b6e65d2ea..557f6e0b140d 100644
--- a/testing/specialpowers/content/SpecialPowersParent.jsm
+++ b/testing/specialpowers/content/SpecialPowersParent.jsm
@@ -53,6 +53,7 @@ class SpecialPowersParent extends SpecialPowersAPIParent {
               },
               type: permission.type,
             };
+          // fall through
           default:
             this._self.sendAsyncMessage("specialpowers-" + aTopic, msg);
         }