diff --git a/include/uv-private/uv-unix.h b/include/uv-private/uv-unix.h
index 729082e0..9e83cd88 100644
--- a/include/uv-private/uv-unix.h
+++ b/include/uv-private/uv-unix.h
@@ -300,8 +300,8 @@ typedef struct {
   void* buf;                                                                  \
   size_t len;                                                                 \
   off_t off;                                                                  \
-  uid_t uid;                                                                  \
-  gid_t gid;                                                                  \
+  uv_uid_t uid;                                                               \
+  uv_gid_t gid;                                                               \
   double atime;                                                               \
   double mtime;                                                               \
   struct uv__work work_req;                                                   \
diff --git a/include/uv.h b/include/uv.h
index c3c68cbb..3978def5 100644
--- a/include/uv.h
+++ b/include/uv.h
@@ -1642,10 +1642,10 @@ UV_EXTERN int uv_fs_fchmod(uv_loop_t* loop, uv_fs_t* req, uv_file file,
     int mode, uv_fs_cb cb);
 
 UV_EXTERN int uv_fs_chown(uv_loop_t* loop, uv_fs_t* req, const char* path,
-    int uid, int gid, uv_fs_cb cb);
+    uv_uid_t uid, uv_gid_t gid, uv_fs_cb cb);
 
 UV_EXTERN int uv_fs_fchown(uv_loop_t* loop, uv_fs_t* req, uv_file file,
-    int uid, int gid, uv_fs_cb cb);
+    uv_uid_t uid, uv_gid_t gid, uv_fs_cb cb);
 
 
 enum uv_fs_event {
diff --git a/src/unix/fs.c b/src/unix/fs.c
index 2f58a563..dde1d3a8 100644
--- a/src/unix/fs.c
+++ b/src/unix/fs.c
@@ -598,8 +598,8 @@ int uv_fs_chmod(uv_loop_t* loop,
 int uv_fs_chown(uv_loop_t* loop,
                 uv_fs_t* req,
                 const char* path,
-                int uid,
-                int gid,
+                uv_uid_t uid,
+                uv_gid_t gid,
                 uv_fs_cb cb) {
   INIT(CHOWN);
   PATH;
@@ -631,8 +631,8 @@ int uv_fs_fchmod(uv_loop_t* loop,
 int uv_fs_fchown(uv_loop_t* loop,
                  uv_fs_t* req,
                  uv_file file,
-                 int uid,
-                 int gid,
+                 uv_uid_t uid,
+                 uv_gid_t gid,
                  uv_fs_cb cb) {
   INIT(FCHOWN);
   req->file = file;
diff --git a/src/win/fs.c b/src/win/fs.c
index 52290a9f..e78bc1b8 100644
--- a/src/win/fs.c
+++ b/src/win/fs.c
@@ -1672,8 +1672,8 @@ int uv_fs_readlink(uv_loop_t* loop, uv_fs_t* req, const char* path,
 }
 
 
-int uv_fs_chown(uv_loop_t* loop, uv_fs_t* req, const char* path, int uid,
-    int gid, uv_fs_cb cb) {
+int uv_fs_chown(uv_loop_t* loop, uv_fs_t* req, const char* path, uv_uid_t uid,
+    uv_gid_t gid, uv_fs_cb cb) {
   uv_fs_req_init(loop, req, UV_FS_CHOWN, cb);
 
   if (fs__capture_path(loop, req, path, NULL, cb != NULL) < 0) {
@@ -1691,8 +1691,8 @@ int uv_fs_chown(uv_loop_t* loop, uv_fs_t* req, const char* path, int uid,
 }
 
 
-int uv_fs_fchown(uv_loop_t* loop, uv_fs_t* req, uv_file fd, int uid,
-    int gid, uv_fs_cb cb) {
+int uv_fs_fchown(uv_loop_t* loop, uv_fs_t* req, uv_file fd, uv_uid_t uid,
+    uv_gid_t gid, uv_fs_cb cb) {
   uv_fs_req_init(loop, req, UV_FS_FCHOWN, cb);
 
   if (cb) {