diff --git a/gunicorn/util.py b/gunicorn/util.py
index fb844c18..c2681154 100644
--- a/gunicorn/util.py
+++ b/gunicorn/util.py
@@ -145,7 +145,7 @@ def set_owner_process(uid, gid, initgroups=False):
         elif gid != os.getgid():
             os.setgid(gid)
 
-    if uid:
+    if uid and uid != os.getuid():
         os.setuid(uid)