diff --git a/openbsc/contrib/dump_all_docs.py b/openbsc/contrib/dump_all_docs.py
index 314f60bab..2903f80ba 100755
--- a/openbsc/contrib/dump_all_docs.py
+++ b/openbsc/contrib/dump_all_docs.py
@@ -26,7 +26,7 @@ def dump_doc(end, port, filename):
 
 	# Now write everything until the end to the file
 	out = open(filename, 'w')
-	out.write(xml[18:len(filename)*-1])
+	out.write(xml[18:len(end)*-1])
 	out.close()