diff --git a/js/src/ion/LICM.cpp b/js/src/ion/LICM.cpp
index 1c290b07b8d..ca0d51319bc 100644
--- a/js/src/ion/LICM.cpp
+++ b/js/src/ion/LICM.cpp
@@ -36,7 +36,7 @@ LICM::analyze()
             continue;
 
         // Attempt to optimize loop.
-        Loop loop(mir, header->backedge(), header, graph);
+        Loop loop(mir, header->backedge(), header);
 
         Loop::LoopReturn lr = loop.init();
         if (lr == Loop::LoopReturn_Error)
@@ -55,9 +55,8 @@ LICM::analyze()
     return true;
 }
 
-Loop::Loop(MIRGenerator *mir, MBasicBlock *footer, MBasicBlock *header, MIRGraph &graph)
+Loop::Loop(MIRGenerator *mir, MBasicBlock *footer, MBasicBlock *header)
   : mir(mir),
-    graph(graph),
     footer_(footer),
     header_(header)
 {
diff --git a/js/src/ion/LICM.h b/js/src/ion/LICM.h
index 4d4255f8f4c..167ac5e920d 100644
--- a/js/src/ion/LICM.h
+++ b/js/src/ion/LICM.h
@@ -36,7 +36,6 @@ class LICM
 class Loop
 {
     MIRGenerator *mir;
-    MIRGraph &graph;
 
   public:
     // Loop code may return three values:
@@ -48,7 +47,7 @@ class Loop
 
   public:
     // A loop is constructed on a backedge found in the control flow graph.
-    Loop(MIRGenerator *mir, MBasicBlock *header, MBasicBlock *footer, MIRGraph &graph);
+    Loop(MIRGenerator *mir, MBasicBlock *header, MBasicBlock *footer);
 
     // Initializes the loop, finds all blocks and instructions contained in the loop.
     LoopReturn init();