diff --git a/lib/blockchain.py b/lib/blockchain.py
index b81c3866c..bb5227427 100644
--- a/lib/blockchain.py
+++ b/lib/blockchain.py
@@ -283,9 +283,9 @@ class Blockchain(util.PrintError):
         # new target
         nActualTimespan = last.get('timestamp') - first.get('timestamp')
         nTargetTimespan = 14 * 24 * 60 * 60
-        nActualTimespan = max(nActualTimespan, nTargetTimespan / 4)
+        nActualTimespan = max(nActualTimespan, nTargetTimespan // 4)
         nActualTimespan = min(nActualTimespan, nTargetTimespan * 4)
-        new_target = min(MAX_TARGET, (target * nActualTimespan) / nTargetTimespan)
+        new_target = min(MAX_TARGET, (target * nActualTimespan) // nTargetTimespan)
         # convert new target to bits
         c = ("%064x" % new_target)[2:]
         while c[:2] == '00' and len(c) > 6: