diff --git a/include/rabit/rabit-inl.h b/include/rabit/rabit-inl.h
index 0939bd2cb..219bff174 100644
--- a/include/rabit/rabit-inl.h
+++ b/include/rabit/rabit-inl.h
@@ -7,7 +7,6 @@
 #ifndef RABIT_RABIT_INL_H
 #define RABIT_RABIT_INL_H
 // use engine for implementation
-#include <cstdint>
 #include "./io.h"
 #include "./utils.h"
 #include "../rabit.h"