diff --git a/mclevel.py b/mclevel.py
index 515fcb2..aa1a6f5 100644
--- a/mclevel.py
+++ b/mclevel.py
@@ -1708,7 +1708,7 @@ class MCInfdevOldLevel(MCLevel):
         if last_played is None:
             last_played = time.time()
         if random_seed is None:
-            random_seed = random.random() * ((2<<31))
+            random_seed = long(random.random() * 0xffffffffffffffffL)
 
         root_tag[Data]['LastPlayed'] = TAG_Long(long(last_played))
         root_tag[Data]['RandomSeed'] = TAG_Long(int(random_seed))