diff --git a/guava/src/main/scala-2/magnolify/guava/FunnelImplicits.scala b/guava/src/main/scala-2/magnolify/guava/FunnelImplicits.scala
index 6cd690603..69c9e5233 100644
--- a/guava/src/main/scala-2/magnolify/guava/FunnelImplicits.scala
+++ b/guava/src/main/scala-2/magnolify/guava/FunnelImplicits.scala
@@ -31,13 +31,13 @@ trait FunnelImplicits {
   implicit val shortFunnel: Funnel[Short] = FunnelInstances.shortFunnel()
 
   implicit def charSequenceFunnel[T <: CharSequence]: Funnel[T] =
-    FunnelInstances.charSequenceFunnel[T]
+    FunnelInstances.charSequenceFunnel[T]()
 
   // There is an implicit Option[T] => Iterable[T]
   implicit def iterableFunnel[T, C[_]](implicit
     fnl: Funnel[T],
     ti: C[T] => Iterable[T]
-  ): Funnel[C[T]] = FunnelInstances.iterableFunnel(fnl).contramap(ti)
+  ): Funnel[C[T]] = FunnelInstances.iterableFunnel(fnl)
 
   implicit def funnelOps[T](fnl: Funnel[T]): FunnelOps[T] = new FunnelOps(fnl)
 }
diff --git a/guava/src/main/scala-3/magnolify/guava/FunnelImplicits.scala b/guava/src/main/scala-3/magnolify/guava/FunnelImplicits.scala
index 28f4e1eab..5f4b8482b 100644
--- a/guava/src/main/scala-3/magnolify/guava/FunnelImplicits.scala
+++ b/guava/src/main/scala-3/magnolify/guava/FunnelImplicits.scala
@@ -30,13 +30,13 @@ trait FunnelImplicits:
   given shortFunnel: Funnel[Short] = FunnelInstances.shortFunnel()
 
   given charSequenceFunnel[T <: CharSequence]: Funnel[T] =
-    FunnelInstances.charSequenceFunnel[T]
+    FunnelInstances.charSequenceFunnel[T]()
 
   // There is an implicit Option[T] => Iterable[T]
   given iterableFunnel[T, C[_]](using
     fnl: Funnel[T],
     ti: C[T] => Iterable[T]
-  ): Funnel[C[T]] = FunnelInstances.iterableFunnel(fnl).contramap(ti)
+  ): Funnel[C[T]] = FunnelInstances.iterableFunnel(fnl)
 
   extension [T](fnl: Funnel[T])
     def contramap[U](f: U => T): Funnel[U] = new Funnel[U]:
diff --git a/guava/src/main/scala/magnolify/guava/FunnelInstances.scala b/guava/src/main/scala/magnolify/guava/FunnelInstances.scala
index 0a360479d..b286bd985 100644
--- a/guava/src/main/scala/magnolify/guava/FunnelInstances.scala
+++ b/guava/src/main/scala/magnolify/guava/FunnelInstances.scala
@@ -35,12 +35,14 @@ object FunnelInstances {
   def charFunnel(): Funnel[Char] = funnel[Char](_.putChar(_))
   def shortFunnel(): Funnel[Short] = funnel[Short](_.putShort(_))
 
-  def charSequenceFunnel[T <: CharSequence]: Funnel[T] =
+  def charSequenceFunnel[T <: CharSequence](): Funnel[T] =
     Funnels.unencodedCharsFunnel().asInstanceOf[Funnel[T]]
-  def iterableFunnel[T](fnl: Funnel[T]): Funnel[Iterable[T]] =
+
+  // There is an implicit Option[T] => Iterable[T]
+  def iterableFunnel[T, C[_]](fnl: Funnel[T])(implicit ti: C[T] => Iterable[T]): Funnel[C[T]] =
     funnel { (sink, xs) =>
       var i = 0
-      xs.foreach { x =>
+      ti(xs).foreach { x =>
         fnl.funnel(x, sink)
         i += 1
       }