diff --git a/include/sys/types.h b/include/sys/types.h
index 03dd1041..a1b0726c 100644
--- a/include/sys/types.h
+++ b/include/sys/types.h
@@ -87,7 +87,7 @@ typedef unsigned long uintptr_t;
 #ifndef __MES_OFF_T
 #define __MES_OFF_T
 #undef off_t
-typedef unsigned long off_t;
+typedef long off_t;
 #endif
 
 #ifndef __MES_OFF64_T