diff --git a/htsinfer/get_library_type.py b/htsinfer/get_library_type.py
index 9524c76..4d4257c 100644
--- a/htsinfer/get_library_type.py
+++ b/htsinfer/get_library_type.py
@@ -131,7 +131,7 @@ def _evaluate_mate_relationship(
             self.mapping.library_type.relationship \
                 = StatesTypeRelationship.not_available
             self.mapping.library_source = self.library_source
-            self.mapping.paths = (self.path_1, self.path_2)
+            self.mapping.paths = self.path_1, self.path_2
             self.mapping.evaluate()
             self._align_mates()