diff --git a/lib/CodeGen/MachineDebugInfo.cpp b/lib/CodeGen/MachineDebugInfo.cpp
index bdbdd144fd7..a48ec4f62ec 100644
--- a/lib/CodeGen/MachineDebugInfo.cpp
+++ b/lib/CodeGen/MachineDebugInfo.cpp
@@ -1629,6 +1629,9 @@ struct DebugLabelFolder : public MachineFunctionPass {
 };
 
 bool DebugLabelFolder::runOnMachineFunction(MachineFunction &MF) {
+  // FIXME - Missing label mapping.
+  return false;
+  
   // Get machine debug info.
   MachineDebugInfo *MDI = getAnalysisToUpdate<MachineDebugInfo>();
   if (!MDI) return false;