--- a/netwerk/ipc/NeckoParent.cpp
+++ b/netwerk/ipc/NeckoParent.cpp
@@ -485,17 +485,18 @@ NeckoParent::DeallocPDataChannelParent(P
   return true;
 }
 
 bool
 NeckoParent::RecvPDataChannelConstructor(PDataChannelParent* actor,
                                          const uint32_t& channelId)
 {
   DataChannelParent* p = static_cast<DataChannelParent*>(actor);
-  MOZ_DIAGNOSTIC_ASSERT(p->Init(channelId));
+  DebugOnly<bool> rv = p->Init(channelId);
+  MOZ_ASSERT(rv);
   return true;
 }
 
 PRtspControllerParent*
 NeckoParent::AllocPRtspControllerParent()
 {
 #ifdef NECKO_PROTOCOL_rtsp
   RtspControllerParent* p = new RtspControllerParent();