diff --git a/python/ql/src/experimental/dataflow/internal/TaintTrackingPrivate.qll b/python/ql/src/experimental/dataflow/internal/TaintTrackingPrivate.qll
index 4402d2add73..cd06726c9c9 100644
--- a/python/ql/src/experimental/dataflow/internal/TaintTrackingPrivate.qll
+++ b/python/ql/src/experimental/dataflow/internal/TaintTrackingPrivate.qll
@@ -196,7 +196,7 @@ predicate copyStep(DataFlow::CfgNode nodeFrom, DataFlow::CfgNode nodeTo) {
     (
       call.getFunction().(NameNode).getId() in ["copy", "deepcopy"]
       or
-      call.getFunction().(AttrNode).getObject("copy").(NameNode).getId() in ["copy", "deepcopy"]
+      call.getFunction().(AttrNode).getObject(["copy", "deepcopy"]).(NameNode).getId() = "copy"
     ) and
     call.getArg(0) = nodeFrom.getNode()
   )