diff --git a/pyDNase/scripts/wellington_bootstrap.py b/pyDNase/scripts/wellington_bootstrap.py
index bd56921..76166cf 100755
--- a/pyDNase/scripts/wellington_bootstrap.py
+++ b/pyDNase/scripts/wellington_bootstrap.py
@@ -71,7 +71,7 @@ def footprints(self, withCutoff = -20, merge = 1):
                 ranges = new_ranges
             # Creates reads GenomicIntervalSet and adds the footprints to them
             for i in merged_ranges:
-                return_set.append(((i[0] + i[1])/2, i[3]))
+                return_set.append((int((i[0] + i[1])/2), i[3]))
         return return_set
 
     def findDiffFP(self):