diff --git a/mutalyzer/Crossmap.py b/mutalyzer/Crossmap.py
index d806e85472bfa1bc06749967984db7794199aad9..577f2d49aed17db9a8e20fec952e5ca58d65cf29 100644
--- a/mutalyzer/Crossmap.py
+++ b/mutalyzer/Crossmap.py
@@ -508,6 +508,8 @@ class Crossmap() :
         @rtype: string
         """
 
+        if t[0] >= self.__trans_end or t[0] <= self.__trans_start:
+            return str(self.int2main(t[0] + t[1]))
         return str(self.int2main(t[0])) + str(self.int2offset(t, fuzzy))
     #tuple2string