diff --git a/src/fenrir-package/screen/linux.py b/src/fenrir-package/screen/linux.py
index f6350fda..c1f5ab6a 100644
--- a/src/fenrir-package/screen/linux.py
+++ b/src/fenrir-package/screen/linux.py
@@ -84,7 +84,7 @@ class screen():
                 if environment['screenData']['oldCursor']['x'] != environment['screenData']['newCursor']['x'] and \
                   environment['screenData']['oldCursor']['y'] == environment['screenData']['newCursor']['y'] and \
                   environment['screenData']['newContentText'][:environment['screenData']['newCursor']['y']] == environment['screenData']['oldContentText'][:environment['screenData']['newCursor']['y']]:
-                    diffStart = environment['screenData']['newCursor']['y'] * environment['screenData']['newCursor']['x'] + environment['screenData']['newCursor']['y']
+                    diffStart = environment['screenData']['newCursor']['y'] * environment['screenData']['columns'] + environment['screenData']['newCursor']['y']
                     diff = difflib.ndiff(environment['screenData']['oldContentText'][diffStart:diffStart  + environment['screenData']['columns']],\
                       environment['screenData']['newContentText'][diffStart:diffStart  + environment['screenData']['columns']])      
                 else: