diff --git a/src/NanoVNASaver/Marker/Values.py b/src/NanoVNASaver/Marker/Values.py
index 3ff66be1..a021756d 100644
--- a/src/NanoVNASaver/Marker/Values.py
+++ b/src/NanoVNASaver/Marker/Values.py
@@ -98,6 +98,6 @@ def store(self, index: int, s11: list[Datapoint], s21: list[Datapoint]):
                 ]
 
         self.freq = s11[1].freq
-        self.s11 = s11[index - 1 : index + 2]
+        self.s11 = s11[index - 1: index + 2]
         if s21:
-            self.s21 = s21[index - 1 : index + 2]
+            self.s21 = s21[index - 1: index + 2]