--- a/xpcom/base/StaticPtr.h
+++ b/xpcom/base/StaticPtr.h
@@ -99,17 +99,25 @@ class MOZ_ONLY_USED_TO_AVOID_STATIC_CONS
 {
 public:
   // In debug builds, check that mRawPtr is initialized for us as we expect
   // by the compiler.  In non-debug builds, don't declare a constructor
   // so that the compiler can see that the constructor is trivial.
 #ifdef DEBUG
   StaticRefPtr()
   {
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wuninitialized"
+  // False positive with gcc. See bug 1430729
+#endif
     MOZ_ASSERT(!mRawPtr);
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
   }
 #endif
 
   StaticRefPtr<T>& operator=(T* aRhs)
   {
     AssignWithAddref(aRhs);
     return *this;
   }