diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index 15f7c7f2eab85..e96eb51b1bc77 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -230,9 +230,9 @@ pub const GRPQUOTA: ::c_int = 1;
 
 pub const SIGIOT: ::c_int = 6;
 
-pub const S_ISUID: ::c_int = 0x800;
-pub const S_ISGID: ::c_int = 0x400;
-pub const S_ISVTX: ::c_int = 0x200;
+pub const S_ISUID: ::mode_t = 0x800;
+pub const S_ISGID: ::mode_t = 0x400;
+pub const S_ISVTX: ::mode_t = 0x200;
 
 pub const IF_NAMESIZE: ::size_t = 16;
 pub const IFNAMSIZ: ::size_t = IF_NAMESIZE;