diff --git a/core/src/main/kotlin/org/nwapw/abacus/function/TreeValueOperator.kt b/core/src/main/kotlin/org/nwapw/abacus/function/TreeValueOperator.kt
index 990ef1c..1087532 100644
--- a/core/src/main/kotlin/org/nwapw/abacus/function/TreeValueOperator.kt
+++ b/core/src/main/kotlin/org/nwapw/abacus/function/TreeValueOperator.kt
@@ -2,7 +2,7 @@ package org.nwapw.abacus.function
 
 import org.nwapw.abacus.function.applicable.ReducerApplicable
 import org.nwapw.abacus.number.NumberInterface
-import javax.swing.tree.TreeNode
+import org.nwapw.abacus.tree.TreeNode
 
 /**
  * An operator that operates on trees.