diff --git a/lib/CodeGen/MachineSink.cpp b/lib/CodeGen/MachineSink.cpp
index 0e18fa7..7717fc8 100644
--- a/lib/CodeGen/MachineSink.cpp
+++ b/lib/CodeGen/MachineSink.cpp
@@ -40,6 +40,7 @@
     virtual bool runOnMachineFunction(MachineFunction &MF);
     
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.setPreservesCFG();
       MachineFunctionPass::getAnalysisUsage(AU);
       AU.addRequired<MachineDominatorTree>();
       AU.addPreserved<MachineDominatorTree>();