diff --git a/core/src/main/scala-latest/scalameta_ast/AddDefaultParam.scala b/core/src/main/scala-latest/scalameta_ast/AddDefaultParam.scala
new file mode 100644
index 0000000..61cc717
--- /dev/null
+++ b/core/src/main/scala-latest/scalameta_ast/AddDefaultParam.scala
@@ -0,0 +1,39 @@
+package scalameta_ast
+
+import scala.annotation.tailrec
+import scala.meta.Position
+import scala.meta.Term
+
+object AddDefaultParam {
+
+  def addDefaultParam(parsed: Term, str: String): String = {
+    val values = parsed.collect {
+      case Term.Apply.After_4_6_0(
+            Term.Select(Term.Name("Term"), Term.Name("ParamClause" | "ArgClause")),
+            Term.ArgClause(
+              List(a),
+              _
+            )
+          ) =>
+        a.pos
+    }
+
+    @tailrec
+    def loop(acc: List[String], code: String, consumed: Int, src: List[Position]): List[String] = {
+      src match {
+        case head :: tail =>
+          val (x1, x2) = code.splitAt(head.end - consumed)
+          loop(
+            s", None" :: x1 :: acc,
+            x2,
+            x1.length + consumed,
+            tail
+          )
+        case Nil =>
+          (code :: acc).reverse
+      }
+    }
+    loop(Nil, str, 0, values).mkString
+  }
+
+}
diff --git a/core/src/main/scala-scalafix_compat-js/scalameta_ast/AddDefaultParam.scala b/core/src/main/scala-scalafix_compat-js/scalameta_ast/AddDefaultParam.scala
new file mode 100644
index 0000000..1a7ef68
--- /dev/null
+++ b/core/src/main/scala-scalafix_compat-js/scalameta_ast/AddDefaultParam.scala
@@ -0,0 +1,9 @@
+package scalameta_ast
+
+import scala.meta.Term
+
+object AddDefaultParam {
+
+  def addDefaultParam(parsed: Term, str: String): String = str
+
+}
diff --git a/core/src/main/scala/scalameta_ast/ScalametaAST.scala b/core/src/main/scala/scalameta_ast/ScalametaAST.scala
index 87ef6e3..5dfe85c 100644
--- a/core/src/main/scala/scalameta_ast/ScalametaAST.scala
+++ b/core/src/main/scala/scalameta_ast/ScalametaAST.scala
@@ -254,7 +254,12 @@ class ScalametaAST {
           }
 
           if (AfterExtractor.enable) {
-            addExtractor(parsed = parsed, str = str, identity) -> parsedOpt
+            val str2 = addExtractor(parsed = parsed, str = str, identity)
+            val parsed2 = implicitly[Parse[Term]].apply(Input.String(str2), scala.meta.dialects.Scala3).get
+            val parsedOpt2 = PartialFunction.condOpt(args) { case x: ScalafixRule =>
+              ParsedValue(() => parsed2, x)
+            }
+            AddDefaultParam.addDefaultParam(parsed = parsed2, str = str2) -> parsedOpt2
           } else {
             if (a.removeNewFields) {
               val str2 = RemoveNewFields.remove(tree = tree, parsed = parsed, str = str)
diff --git a/core/src/test/scala-latest-js/scalameta_ast/ScalametaASTSpec2.scala b/core/src/test/scala-latest-js/scalameta_ast/ScalametaASTSpec2.scala
index 06ca0ee..3f46d3a 100644
--- a/core/src/test/scala-latest-js/scalameta_ast/ScalametaASTSpec2.scala
+++ b/core/src/test/scala-latest-js/scalameta_ast/ScalametaASTSpec2.scala
@@ -11,6 +11,25 @@ class ScalametaASTSpec2 extends AnyFreeSpec {
   "ScalametaAST" - {
     val main = new ScalametaAST
 
+    "Term.ParamClause and ArgClause" in {
+      val expect =
+        """Defn.Def.After_4_7_3(Nil, Term.Name("a"), List(Member.ParamClauseGroup(Type.ParamClause(Nil), List(Term.ParamClause(List(Term.Param(Nil, Term.Name("b"), Some(Type.Name("C")), None)), None)))), None, Term.Apply.After_4_6_0(Term.Name("d"), Term.ArgClause(List(Term.Name("e")), None)))"""
+      val result = main.convert(
+        src = "def a(b: C) = d(e)",
+        outputType = "",
+        packageName = None,
+        wildcardImport = false,
+        ruleNameOption = None,
+        dialect = None,
+        patch = None,
+        removeNewFields = false,
+        initialExtractor = false,
+        explanation = true,
+        pathFilter = false,
+      )
+      assert(result.result == expect)
+    }
+
     "Term.If" in {
       val expect =
         """Term.If.After_4_4_0(Term.Name("a"), Term.Name("b"), Term.If.After_4_4_0(Term.Name("x"), Term.Name("y"), Term.Select(Term.Name("z"), Term.Name("f")), Nil), Nil)"""