diff --git a/js/src/methodjit/FrameEntry.h b/js/src/methodjit/FrameEntry.h
index 69997af03b8..644382d8714 100644
--- a/js/src/methodjit/FrameEntry.h
+++ b/js/src/methodjit/FrameEntry.h
@@ -157,7 +157,6 @@ class FrameEntry
     jsval_layout v_;
     FrameEntry *copy;
     bool        copied;
-    FrameEntry *prev;
 };
 
 } /* namespace mjit */