diff --git a/csv/generic/shared/src/main/scala-3/fs2/data/csv/generic/internal/CellValue.scala b/csv/generic/shared/src/main/scala-3/fs2/data/csv/generic/internal/CellValue.scala
index f2485a45..f4fee6a9 100644
--- a/csv/generic/shared/src/main/scala-3/fs2/data/csv/generic/internal/CellValue.scala
+++ b/csv/generic/shared/src/main/scala-3/fs2/data/csv/generic/internal/CellValue.scala
@@ -26,10 +26,16 @@ trait CellValue[T] {
   def value: String
 }
 
+private class AnnotationCellValue[T](a: Annotation[CsvValue, T]) extends CellValue[T] {
+  def value: String = a().value
+}
+
+private class ConstantCellValue[T](val value: String) extends CellValue[T]
+
 object CellValue {
   inline given deriveSingleton[T](using m: Mirror.ProductOf[T] { type MirroredElemTypes = EmptyTuple }): CellValue[T] =
     summonFrom {
-      case a: Annotation[CsvValue, T] => new CellValue[T] { def value: String = a().value }
-      case _                          => new CellValue[T] { def value: String = constValue[m.MirroredLabel] }
+      case a: Annotation[CsvValue, T] => new AnnotationCellValue[T](a)
+      case _                          => new ConstantCellValue[T](constValue[m.MirroredLabel])
     }
 }
diff --git a/csv/generic/shared/src/main/scala-3/fs2/data/csv/generic/internal/DerivedCellDecoder.scala b/csv/generic/shared/src/main/scala-3/fs2/data/csv/generic/internal/DerivedCellDecoder.scala
index 038e5de2..37ba6a8b 100644
--- a/csv/generic/shared/src/main/scala-3/fs2/data/csv/generic/internal/DerivedCellDecoder.scala
+++ b/csv/generic/shared/src/main/scala-3/fs2/data/csv/generic/internal/DerivedCellDecoder.scala
@@ -25,6 +25,11 @@ import scala.deriving.Mirror
 
 trait DerivedCellDecoder[T] extends CellDecoder[T]
 
+private class CoproductDerivedCellDecoder[T](decoders: List[DerivedCellDecoder[T]]) extends DerivedCellDecoder[T] {
+  def apply(in: String) =
+    decoders.foldRight(new DecoderError("Didn't match any value").asLeft)(_.apply(in).orElse(_))
+}
+
 object DerivedCellDecoder {
   def expect[T](e: String, r: T): DerivedCellDecoder[T] = (in: String) =>
     Either.cond(in == e, r, new DecoderError(s"Expected $e, got $in"))
@@ -38,10 +43,7 @@ object DerivedCellDecoder {
   inline given deriveCoproduct[T](using m: Mirror.SumOf[T]): DerivedCellDecoder[T] = {
     val decoders: List[DerivedCellDecoder[T]] =
       summonAsArray[K0.LiftP[DerivedCellDecoder, m.MirroredElemTypes]].toList.asInstanceOf
-    new DerivedCellDecoder[T] {
-      def apply(in: String) =
-        decoders.foldRight(new DecoderError("Didn't match any value").asLeft)(_.apply(in).orElse(_))
-    }
+    new CoproductDerivedCellDecoder[T](decoders)
   }
 
   inline given deriveSingleton[T](using cv: CellValue[T], m: Mirror.ProductOf[T]): DerivedCellDecoder[T] =
diff --git a/csv/generic/shared/src/main/scala-3/fs2/data/csv/generic/internal/DerivedCellEncoder.scala b/csv/generic/shared/src/main/scala-3/fs2/data/csv/generic/internal/DerivedCellEncoder.scala
index 5ee4dfa0..44b90d37 100644
--- a/csv/generic/shared/src/main/scala-3/fs2/data/csv/generic/internal/DerivedCellEncoder.scala
+++ b/csv/generic/shared/src/main/scala-3/fs2/data/csv/generic/internal/DerivedCellEncoder.scala
@@ -31,14 +31,12 @@ object DerivedCellEncoder {
     ce(t.productElement(0).asInstanceOf[Tuple.Head[m.MirroredElemTypes]])
   }
 
-  inline given deriveCoproduct[T](using g: K0.CoproductInstances[DerivedCellEncoder, T]): DerivedCellEncoder[T] =
-    new DerivedCellEncoder[T] {
-      def apply(elem: T) = g.fold(elem)([t <: T] => (dce: DerivedCellEncoder[t], te: t) => dce(te))
-    }
-
-  inline given deriveSingleton[T](using cv: CellValue[T]): DerivedCellEncoder[T] =
-    new DerivedCellEncoder[T] {
-      def apply(t: T) = cv.value
-    }
+  inline given deriveCoproduct[T](using g: K0.CoproductInstances[DerivedCellEncoder, T]): DerivedCellEncoder[T] with {
+    def apply(elem: T) = g.fold(elem)([t <: T] => (dce: DerivedCellEncoder[t], te: t) => dce(te))
+  }
+
+  inline given deriveSingleton[T](using cv: CellValue[T]): DerivedCellEncoder[T] with {
+    def apply(t: T) = cv.value
+  }
 
 }