diff --git a/lib/CodeGen/PostRASchedulerList.cpp b/lib/CodeGen/PostRASchedulerList.cpp
index ad8ba6c0137..66bcf8cec82 100644
--- a/lib/CodeGen/PostRASchedulerList.cpp
+++ b/lib/CodeGen/PostRASchedulerList.cpp
@@ -229,6 +229,8 @@ static bool isSchedulingBoundary(const MachineInstr *MI,
 }
 
 bool PostRAScheduler::runOnMachineFunction(MachineFunction &Fn) {
+  AA = &getAnalysis<AliasAnalysis>();
+
   // Check for explicit enable/disable of post-ra scheduling.
   if (EnablePostRAScheduler.getPosition() > 0) {
     if (!EnablePostRAScheduler)