diff --git a/core/src/main/scala-3/sttp/tapir/typelevel/IntersectionTypeMirror.scala b/core/src/main/scala-3/sttp/tapir/typelevel/IntersectionTypeMirror.scala
index cb218f056f..ac7624b2fa 100644
--- a/core/src/main/scala-3/sttp/tapir/typelevel/IntersectionTypeMirror.scala
+++ b/core/src/main/scala-3/sttp/tapir/typelevel/IntersectionTypeMirror.scala
@@ -20,7 +20,8 @@ object IntersectionTypeMirror {
   private def derivedImpl[A](using Quotes, Type[A]): Expr[IntersectionTypeMirror[A]] = {
     import quotes.reflect.*
 
-    val tplPrependType = TypeRepr.of[? *: ?]
+    val tplPrependType = TypeRepr.of[? *: ?] match
+      case AppliedType(tycon, _) => tycon
     val tplConcatType = TypeRepr.of[Tuple.Concat]
 
     def prependTypes(head: TypeRepr, tail: TypeRepr): TypeRepr =
diff --git a/core/src/main/scala-3/sttp/tapir/typelevel/UnionTypeMirror.scala b/core/src/main/scala-3/sttp/tapir/typelevel/UnionTypeMirror.scala
index db42092662..e634a8b5d2 100644
--- a/core/src/main/scala-3/sttp/tapir/typelevel/UnionTypeMirror.scala
+++ b/core/src/main/scala-3/sttp/tapir/typelevel/UnionTypeMirror.scala
@@ -21,7 +21,8 @@ object UnionTypeMirror {
   private def derivedImpl[A](using Quotes, Type[A]): Expr[UnionTypeMirror[A]] = {
     import quotes.reflect.*
 
-    val tplPrependType = TypeRepr.of[? *: ?]
+    val tplPrependType = TypeRepr.of[? *: ?] match
+      case AppliedType(tycon, _) => tycon
     val tplConcatType = TypeRepr.of[Tuple.Concat]
 
     def prependTypes(head: TypeRepr, tail: TypeRepr): TypeRepr =