diff --git a/PFERD/transformer.py b/PFERD/transformer.py
index 0f2a3e6..23844f8 100644
--- a/PFERD/transformer.py
+++ b/PFERD/transformer.py
@@ -156,8 +156,8 @@ class Line:
         return self._line
 
     @property
-    def line_nr(self) -> str:
-        return self._line
+    def line_nr(self) -> int:
+        return self._line_nr
 
     @property
     def index(self) -> int: