diff --git a/Lib/idlelib/run.py b/Lib/idlelib/run.py
index 6659ee7..fd2cc09 100644
--- a/Lib/idlelib/run.py
+++ b/Lib/idlelib/run.py
@@ -72,7 +72,8 @@
         assert(len(sys.argv) > 1)
         port = int(sys.argv[-1])
     except:
-        print>>sys.stderr, "IDLE Subprocess: no IP port passed in sys.argv."
+        print("IDLE Subprocess: no IP port passed in sys.argv.",
+              file=sys.__stderr__)
         return
     sys.argv[:] = [""]
     sockthread = threading.Thread(target=manage_socket,