diff --git a/panoptica/instance_evaluator.py b/panoptica/instance_evaluator.py
index f1974ab..f27fb11 100644
--- a/panoptica/instance_evaluator.py
+++ b/panoptica/instance_evaluator.py
@@ -11,6 +11,7 @@
 from panoptica.timing import measure_time
 from panoptica.utils import EdgeCaseHandler
 from panoptica.utils.processing_pair import MatchedInstancePair
+from panoptica.metrics import Metrics
 
 
 def evaluate_matched_instance(
diff --git a/panoptica/panoptic_evaluator.py b/panoptica/panoptic_evaluator.py
index ae904d4..07535ae 100644
--- a/panoptica/panoptic_evaluator.py
+++ b/panoptica/panoptic_evaluator.py
@@ -17,7 +17,6 @@
 )
 from panoptica.utils.citation_reminder import citation_reminder
 
-
 class Panoptic_Evaluator:
     def __init__(
         self,