diff --git a/xpcom/ds/nsTArray.h b/xpcom/ds/nsTArray.h
--- a/xpcom/ds/nsTArray.h
+++ b/xpcom/ds/nsTArray.h
@@ -2970,11 +2970,11 @@
       // FIXME: Conceptually `value_type mElements[N]`, but that upsets the
       // hazard analysis, see bug 1880185.
       char mStorage[sizeof(value_type) * N];
     };
     AutoBuffer() : mHdr{.mLength = 0, .mCapacity = N, .mIsAutoArray = true} {}
-    ~AutoBuffer() {}
+    ~AutoBuffer() = default;
   } mAutoBuf;
   static_assert(offsetof(AutoBuffer, mStorage) == sizeof(nsTArrayHeader),
                 "Shouldn't have padding");
 };