diff --git a/otautil/SysUtil.cpp b/otautil/SysUtil.cpp
index a8d5f4a..a2133b9 100644
--- a/otautil/SysUtil.cpp
+++ b/otautil/SysUtil.cpp
@@ -16,17 +16,12 @@
 
 #include "SysUtil.h"
 
-#include <assert.h>
 #include <errno.h>
 #include <fcntl.h>
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+#include <stdint.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/types.h>
-#include <unistd.h>
 
 #include <algorithm>
 #include <string>