diff --git a/ipc/mscom/Interceptor.cpp b/ipc/mscom/Interceptor.cpp
index 4c398aa8d787..6ac01169c285 100644
--- a/ipc/mscom/Interceptor.cpp
+++ b/ipc/mscom/Interceptor.cpp
@@ -28,6 +28,15 @@
 #include "nsThreadUtils.h"
 #include "nsXULAppAPI.h"
 
+#if defined(MOZ_DEV_EDITION) || defined(RELEASE_OR_BETA)
+
+#define ENSURE_HR_SUCCEEDED(hr) \
+  if (FAILED((HRESULT)hr)) { \
+    return hr; \
+  }
+
+#else
+
 #define ENSURE_HR_SUCCEEDED(hr) \
   if (FAILED((HRESULT)hr)) { \
     nsPrintfCString location("ENSURE_HR_SUCCEEDED \"%s\": %u", __FILE__, __LINE__); \
@@ -37,6 +46,8 @@
     return hr; \
   }
 
+#endif // defined(MOZ_DEV_EDITION) || defined(RELEASE_OR_BETA)
+
 namespace mozilla {
 namespace mscom {
 namespace detail {
diff --git a/ipc/mscom/ProxyStream.cpp b/ipc/mscom/ProxyStream.cpp
index a74043c124be..d69158c5af33 100644
--- a/ipc/mscom/ProxyStream.cpp
+++ b/ipc/mscom/ProxyStream.cpp
@@ -331,7 +331,9 @@ ProxyStream::ProxyStream(REFIID aIID, IUnknown* aObject, Environment* aEnv,
 
     marshalResult = ::CoMarshalInterface(stream, aIID, aObject, MSHCTX_LOCAL,
                                          nullptr, mshlFlags);
+#if !defined(MOZ_DEV_EDITION)
     MOZ_DIAGNOSTIC_ASSERT(marshalResult != E_INVALIDARG);
+#endif // !defined(MOZ_DEV_EDITION)
     if (FAILED(marshalResult)) {
       return;
     }