diff --git a/gfx/ipc/GfxMessageUtils.h b/gfx/ipc/GfxMessageUtils.h
index ca59a3e86f04..7be7bd6d347d 100644
--- a/gfx/ipc/GfxMessageUtils.h
+++ b/gfx/ipc/GfxMessageUtils.h
@@ -575,21 +575,21 @@ struct ParamTraits<mozilla::gfx::RectAbsoluteTyped<T>> {
 
   static void Write(Message* msg, const paramType& param) {
     WriteParam(msg, param.Left());
-    WriteParam(msg, param.Right());
     WriteParam(msg, param.Top());
+    WriteParam(msg, param.Right());
     WriteParam(msg, param.Bottom());
   }
 
   static bool Read(const Message* msg, PickleIterator* iter,
                    paramType* result) {
     auto l = result->Left();
-    auto r = result->Right();
     auto t = result->Top();
+    auto r = result->Right();
     auto b = result->Bottom();
 
-    bool retVal = (ReadParam(msg, iter, &l) && ReadParam(msg, iter, &r) &&
-                   ReadParam(msg, iter, &t) && ReadParam(msg, iter, &b));
-    result->SetBox(l, r, t, b);
+    bool retVal = (ReadParam(msg, iter, &l) && ReadParam(msg, iter, &t) &&
+                   ReadParam(msg, iter, &r) && ReadParam(msg, iter, &b));
+    result->SetBox(l, t, r, b);
     return retVal;
   }
 };