--- a/js/src/vm/Symbol.cpp
+++ b/js/src/vm/Symbol.cpp
@@ -4,16 +4,17 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "vm/Symbol.h"
 
 #include "jscntxt.h"
 #include "jscompartment.h"
 
+#include "builtin/SymbolObject.h"
 #include "gc/Rooting.h"
 #include "vm/StringBuffer.h"
 
 #include "jscompartmentinlines.h"
 #include "jsgcinlines.h"
 
 using JS::Symbol;
 using namespace js;