diff --git a/lib/MC/MCContext.cpp b/lib/MC/MCContext.cpp
index 7c687135fc6..af8cd8eb141 100644
--- a/lib/MC/MCContext.cpp
+++ b/lib/MC/MCContext.cpp
@@ -85,12 +85,11 @@ MCSymbol *MCContext::CreateSymbol(StringRef Name) {
   StringMapEntry<bool> *NameEntry = &UsedNames.GetOrCreateValue(Name);
   if (NameEntry->getValue()) {
     assert(isTemporary && "Cannot rename non temporary symbols");
-    SmallString<128> NewName;
+    SmallString<128> NewName = Name;
     do {
-      Twine T = Name + Twine(NextUniqueID++);
-      T.toVector(NewName);
-      StringRef foo = NewName;
-      NameEntry = &UsedNames.GetOrCreateValue(foo);
+      NewName.resize(Name.size());
+      raw_svector_ostream(NewName) << NextUniqueID++;
+      NameEntry = &UsedNames.GetOrCreateValue(NewName);
     } while (NameEntry->getValue());
   }
   NameEntry->setValue(true);
@@ -110,9 +109,8 @@ MCSymbol *MCContext::GetOrCreateSymbol(const Twine &Name) {
 
 MCSymbol *MCContext::CreateTempSymbol() {
   SmallString<128> NameSV;
-  Twine Name = Twine(MAI.getPrivateGlobalPrefix()) + "tmp" +
-    Twine(NextUniqueID++);
-  Name.toVector(NameSV);
+  raw_svector_ostream(NameSV)
+    << MAI.getPrivateGlobalPrefix() << "tmp" << NextUniqueID++;
   return CreateSymbol(NameSV);
 }
 
diff --git a/test/MC/AsmParser/rename.s b/test/MC/AsmParser/rename.s
index 64ca5153812..934cee808bd 100644
--- a/test/MC/AsmParser/rename.s
+++ b/test/MC/AsmParser/rename.s
@@ -1,10 +1,14 @@
 // RUN: llvm-mc -triple i386-unknown-unknown %s | FileCheck %s
 
         .size bar, . - bar
+.Ltmp01:
+       .size foo, .Ltmp01 - foo
 .Ltmp0:
-       .size foo, .Ltmp0 - foo
+       .size qux, .Ltmp0 - qux
 
 // CHECK: .Ltmp0:
 // CHECK: .size  bar, .Ltmp0-bar
 // CHECK: .Ltmp01
 // CHECK: .size foo, .Ltmp01-foo
+// CHECK: .Ltmp02
+// CHECK: .size qux, .Ltmp02-qux