diff --git a/dom/workers/RuntimeService.cpp b/dom/workers/RuntimeService.cpp
index 24a6fa8db50..9fcd55ffe09 100644
--- a/dom/workers/RuntimeService.cpp
+++ b/dom/workers/RuntimeService.cpp
@@ -99,7 +99,7 @@ MOZ_STATIC_ASSERT(MAX_WORKERS_PER_DOMAIN >= 1,
     if (!workers.IsEmpty()) {                                                  \
       AutoSafeJSContext cx;                                                    \
       for (uint32_t index = 0; index < workers.Length(); index++) {            \
-        workers[index]-> _func (cx, ##__VA_ARGS__);                            \
+        workers[index]-> _func (cx, __VA_ARGS__);                              \
       }                                                                        \
     }                                                                          \
   PR_END_MACRO