diff --git a/js/src/irregexp/RegExpCharRanges.cpp b/js/src/irregexp/RegExpCharRanges.cpp
index 99c671ebcd..e45b379a0c 100644
--- a/js/src/irregexp/RegExpCharRanges.cpp
+++ b/js/src/irregexp/RegExpCharRanges.cpp
@@ -39,6 +39,7 @@
 
 using namespace js::irregexp;
 
+using js::LifoAlloc;
 using mozilla::ArrayLength;
 
 void