diff --git a/llvm/lib/Support/LockFileManager.cpp b/llvm/lib/Support/LockFileManager.cpp
index 4f7ebd4..d97452d 100644
--- a/llvm/lib/Support/LockFileManager.cpp
+++ b/llvm/lib/Support/LockFileManager.cpp
@@ -12,6 +12,7 @@
 #include "llvm/ADT/ScopeExit.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringExtras.h"
+#include "llvm/Config/llvm-config.h"
 #include "llvm/Support/Errc.h"
 #include "llvm/Support/ErrorOr.h"
 #include "llvm/Support/FileSystem.h"