diff --git a/mutalyzer/Retriever.py b/mutalyzer/Retriever.py
index ac09bafa3a735b7af6cd445633baeb47dacaf8a2..e22536e3bb2e79eaf712352f3a2c7e4657c562b7 100644
--- a/mutalyzer/Retriever.py
+++ b/mutalyzer/Retriever.py
@@ -593,8 +593,8 @@ class GenBankRetriever(Retriever):
                 #if
                 ChrAccVer = unicode(summary[0]["GenomicInfo"][0]["ChrAccVer"])
                 ChrLoc = unicode(summary[0]["GenomicInfo"][0]["ChrLoc"])
-                ChrStart = unicode(summary[0]["GenomicInfo"][0]["ChrStart"])
-                ChrStop = unicode(summary[0]["GenomicInfo"][0]["ChrStop"])
+                ChrStart = int(summary[0]["GenomicInfo"][0]["ChrStart"])
+                ChrStop = int(summary[0]["GenomicInfo"][0]["ChrStop"])
                 break
             #if