diff --git a/include/llvm/Analysis/ScalarEvolution.h b/include/llvm/Analysis/ScalarEvolution.h
index 6f57c74..9072a8f 100644
--- a/include/llvm/Analysis/ScalarEvolution.h
+++ b/include/llvm/Analysis/ScalarEvolution.h
@@ -181,6 +181,10 @@
     ///
     TargetData *TD;
 
+    /// DT - The dominator tree.
+    ///
+    DominatorTree *DT;
+
     /// CouldNotCompute - This SCEV is used to represent unknown trip
     /// counts and things.
     SCEVCouldNotCompute CouldNotCompute;
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index 4d85ce4..a06321c 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -5167,6 +5167,7 @@
 bool ScalarEvolution::runOnFunction(Function &F) {
   this->F = &F;
   LI = &getAnalysis<LoopInfo>();
+  DT = &getAnalysis<DominatorTree>();
   TD = getAnalysisIfAvailable<TargetData>();
   return false;
 }
@@ -5183,6 +5184,7 @@
 void ScalarEvolution::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.setPreservesAll();
   AU.addRequiredTransitive<LoopInfo>();
+  AU.addRequiredTransitive<DominatorTree>();
 }
 
 bool ScalarEvolution::hasLoopInvariantBackedgeTakenCount(const Loop *L) {