diff --git a/R-package/src/xgboost_R.cpp b/R-package/src/xgboost_R.cpp
index 70d2e71de..96d3871b1 100644
--- a/R-package/src/xgboost_R.cpp
+++ b/R-package/src/xgboost_R.cpp
@@ -1,8 +1,8 @@
-#include "xgboost_R.h"
 #include <vector>
 #include <string>
 #include <utility>
 #include <cstring>
+#include "xgboost_R.h"
 #include "wrapper/xgboost_wrapper.h"
 #include "src/utils/utils.h"
 #include "src/utils/omp.h"