diff --git a/src/swarm-topography/Swarm/Game/Scenario/Topography/Structure/Recognition/Prep.hs b/src/swarm-topography/Swarm/Game/Scenario/Topography/Structure/Recognition/Prep.hs
index 84b6db93b..7f174dfbe 100644
--- a/src/swarm-topography/Swarm/Game/Scenario/Topography/Structure/Recognition/Prep.hs
+++ b/src/swarm-topography/Swarm/Game/Scenario/Topography/Structure/Recognition/Prep.hs
@@ -130,14 +130,14 @@ trimRow xs =
     , leftDrops = nullPrefixLength
     , rightDrops = nullSuffixLength
     }
-  where
-    (nullPrefixLength, remainingTail) = countDrops xs
-    (nullSuffixLength, remainingMiddleReversed) = countDrops $ reverse remainingTail
-
-    countDrops s =
-      (length nulls, remainder)
-      where
-        (nulls, remainder) = span null s
+ where
+  (nullPrefixLength, remainingTail) = countDrops xs
+  (nullSuffixLength, remainingMiddleReversed) = countDrops $ reverse remainingTail
+
+  countDrops s =
+    (length nulls, remainder)
+   where
+    (nulls, remainder) = span null s
 
 -- * Util