diff --git a/lib/Analysis/LoopInfo.cpp b/lib/Analysis/LoopInfo.cpp
index d99f0f70d92..29558dab8b5 100644
--- a/lib/Analysis/LoopInfo.cpp
+++ b/lib/Analysis/LoopInfo.cpp
@@ -18,7 +18,7 @@ AnalysisID LoopInfo::ID(AnalysisID::create<LoopInfo>(), true);
 //===----------------------------------------------------------------------===//
 // Loop implementation
 //
-bool Loop::contains(BasicBlock *BB) const {
+bool Loop::contains(const BasicBlock *BB) const {
   return find(Blocks.begin(), Blocks.end(), BB) != Blocks.end();
 }