diff --git a/Lib/uuid.py b/Lib/uuid.py
index 684bbeb..ae3da25 100644
--- a/Lib/uuid.py
+++ b/Lib/uuid.py
@@ -488,8 +488,8 @@
     # 0x01b21dd213814000 is the number of 100-ns intervals between the
     # UUID epoch 1582-10-15 00:00:00 and the Unix epoch 1970-01-01 00:00:00.
     timestamp = int(nanoseconds/100) + 0x01b21dd213814000L
-    if timestamp == _last_timestamp:
-        timestamp += 1
+    if timestamp <= _last_timestamp:
+        timestamp = _last_timestamp + 1
     _last_timestamp = timestamp
     if clock_seq is None:
         import random