diff --git a/include/llvm/CodeGen/JITCodeEmitter.h b/include/llvm/CodeGen/JITCodeEmitter.h
index 21a3f481a56..9a732141869 100644
--- a/include/llvm/CodeGen/JITCodeEmitter.h
+++ b/include/llvm/CodeGen/JITCodeEmitter.h
@@ -207,8 +207,7 @@ public:
   /// emitString - This callback is invoked when a String needs to be
   /// written to the output stream.
   void emitString(const std::string &String) {
-    for (unsigned i = 0, N = static_cast<unsigned>(String.size());
-         i < N; ++i) {
+    for (size_t i = 0, N = String.size(); i < N; ++i) {
       uint8_t C = String[i];
       emitByte(C);
     }