diff --git a/lib/Target/X86/X86CodeEmitter.cpp b/lib/Target/X86/X86CodeEmitter.cpp
index 2ada46d..683b137 100644
--- a/lib/Target/X86/X86CodeEmitter.cpp
+++ b/lib/Target/X86/X86CodeEmitter.cpp
@@ -70,6 +70,7 @@
                          const TargetInstrDesc *Desc);
     
     void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.setPreservesAll();
       AU.addRequired<MachineModuleInfo>();
       MachineFunctionPass::getAnalysisUsage(AU);
     }