diff --git a/ServerBench.cpp b/ServerBench.cpp
index 4abde84..c85bf4d 100644
--- a/ServerBench.cpp
+++ b/ServerBench.cpp
@@ -12,6 +12,7 @@
 #include <sys/ioctl.h>
 #include <sys/resource.h>
 #include <sys/socket.h>
+#include <sys/syscall.h>
 #include <sys/types.h>
 #include <sys/uio.h>
 #include <thread>