diff --git a/lib/Transforms/Scalar/IndVarSimplify.cpp b/lib/Transforms/Scalar/IndVarSimplify.cpp
index efa587b221e..cf2daa1ddc1 100644
--- a/lib/Transforms/Scalar/IndVarSimplify.cpp
+++ b/lib/Transforms/Scalar/IndVarSimplify.cpp
@@ -79,6 +79,7 @@ namespace {
       AU.addRequired<ScalarEvolution>();
       AU.addRequired<LoopInfo>();
       AU.addPreservedID(LoopSimplifyID);
+      AU.addPreservedID(LCSSAID);
       AU.setPreservesCFG();
     }
   private:
@@ -570,4 +571,6 @@ void IndVarSimplify::runOnLoop(Loop *L) {
 #endif
 
   DeleteTriviallyDeadInstructions(DeadInsts);
+  
+  assert(L->isLCSSAForm());
 }