diff --git a/lib/CodeGen/CGDeclCXX.cpp b/lib/CodeGen/CGDeclCXX.cpp
index 674cbe79f7bd27a2f9868a38f4820f326908a0b8..06d157bd82e7691d729c9d4c0879a18e836e8208 100644
--- a/lib/CodeGen/CGDeclCXX.cpp
+++ b/lib/CodeGen/CGDeclCXX.cpp
@@ -431,7 +431,7 @@ CodeGenModule::EmitCXXGlobalInitFunc() {
     // priority emitted above.
     FileName = llvm::sys::path::filename(MainFile->getName());
   } else {
-    FileName = SmallString<128>("<null>");
+    FileName = "<null>";
   }
 
   for (size_t i = 0; i < FileName.size(); ++i) {