diff --git a/src/ol/render/canvas/Executor.js b/src/ol/render/canvas/Executor.js
index 92c1cf4e87..ccdf260033 100644
--- a/src/ol/render/canvas/Executor.js
+++ b/src/ol/render/canvas/Executor.js
@@ -362,7 +362,7 @@ class Executor {
         null;
       if (declutterArgs) {
         if (fillStroke) {
-          declutterArgs.push(fillInstruction, strokeInstruction, p1, p2, p3, p4);
+          declutterArgs.push(fillInstruction, strokeInstruction, p1.slice(0), p2.slice(0), p3.slice(0), p4.slice(0));
         }
         declutterGroup.push(declutterArgs);
       }