diff --git a/gitstats b/gitstats
index 2ebf36d..5e75552 100755
--- a/gitstats
+++ b/gitstats
@@ -581,7 +581,7 @@ class GitDataCollector(DataCollector):
 		return res[:limit]
 	
 	def getCommitDeltaDays(self):
-		return (self.last_commit_stamp - self.first_commit_stamp) / 86400 + 1
+		return (self.last_commit_stamp / 86400 - self.first_commit_stamp / 86400) + 1
 
 	def getDomainInfo(self, domain):
 		return self.domains[domain]