diff --git a/lib/Tooling/AllTUsExecution.cpp b/lib/Tooling/AllTUsExecution.cpp
index 267f945..d85075f 100644
--- a/lib/Tooling/AllTUsExecution.cpp
+++ b/lib/Tooling/AllTUsExecution.cpp
@@ -8,6 +8,7 @@
 
 #include "clang/Tooling/AllTUsExecution.h"
 #include "clang/Tooling/ToolExecutorPluginRegistry.h"
+#include "llvm/Support/Threading.h"
 #include "llvm/Support/ThreadPool.h"
 #include "llvm/Support/VirtualFileSystem.h"