diff --git a/llvm/lib/IR/BasicBlock.cpp b/llvm/lib/IR/BasicBlock.cpp
index 9f806fa..4640b4f 100644
--- a/llvm/lib/IR/BasicBlock.cpp
+++ b/llvm/lib/IR/BasicBlock.cpp
@@ -217,8 +217,8 @@
 }
 
 void BasicBlock::dropAllReferences() {
-  for(iterator I = begin(), E = end(); I != E; ++I)
-    I->dropAllReferences();
+  for (Instruction &I : *this)
+    I.dropAllReferences();
 }
 
 /// If this basic block has a single predecessor block,