diff --git a/llvm/lib/Support/Valgrind.cpp b/llvm/lib/Support/Valgrind.cpp
index 3cf41faeb55d..5994656c5c03 100644
--- a/llvm/lib/Support/Valgrind.cpp
+++ b/llvm/lib/Support/Valgrind.cpp
@@ -12,9 +12,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include <stddef.h>
 #include "llvm/Support/Valgrind.h"
 #include "llvm/Config/config.h"
-#include <cstddef>
 
 #if HAVE_VALGRIND_VALGRIND_H
 #include <valgrind/valgrind.h>