diff --git a/cpuset/commands/proc.py b/cpuset/commands/proc.py
index 353292f..855626d 100644
--- a/cpuset/commands/proc.py
+++ b/cpuset/commands/proc.py
@@ -569,6 +569,7 @@ def run(tset, args, usr_par=None, grp_par=None):
         os.setuid(user)
         os.environ["LOGNAME"] = usr_par
         os.environ["USERNAME"] = usr_par
+        os.environ["USER"] = usr_par
     os.execvp(args[0], args)
 
 def is_unbound(proc):