diff --git a/packages/tools/src/tools/displayTools/Labelmap/labelmapDisplay.ts b/packages/tools/src/tools/displayTools/Labelmap/labelmapDisplay.ts
index f86a6c842f..9f63b54015 100644
--- a/packages/tools/src/tools/displayTools/Labelmap/labelmapDisplay.ts
+++ b/packages/tools/src/tools/displayTools/Labelmap/labelmapDisplay.ts
@@ -416,7 +416,7 @@ function _needsTransferFunctionUpdate(
       renderFill,
       renderOutline,
       outlineWidth,
-      segmentColor,
+      segmentColor: segmentColor.slice(), // Create a copy
       segmentsHidden: new Set(segmentsHidden), // Create a copy
     });