diff --git a/lib/pipe_transport.ex b/lib/pipe_transport.ex
index 807db2f6..f127d5ee 100644
--- a/lib/pipe_transport.ex
+++ b/lib/pipe_transport.ex
@@ -114,7 +114,7 @@ defmodule Mediasoup.PipeTransport do
     GenServer.call(pid, {:consume, [option]})
   end
 
-  def consume(transport, option) do
+  def consume(%PipeTransport{} = transport, option) do
     consume(transport, Consumer.Options.from_map(option))
   end
 
@@ -128,7 +128,7 @@ defmodule Mediasoup.PipeTransport do
     GenServer.call(pid, {:consume_data, [option]})
   end
 
-  def consume_data(transport, option) do
+  def consume_data(%PipeTransport{} = transport, option) do
     consume_data(transport, DataConsumer.Options.from_map(option))
   end
 
@@ -151,7 +151,7 @@ defmodule Mediasoup.PipeTransport do
     GenServer.call(pid, {:produce, [option]})
   end
 
-  def produce(transport, %{} = option) do
+  def produce(%PipeTransport{} = transport, %{} = option) do
     produce(transport, Producer.Options.from_map(option))
   end
 
@@ -165,7 +165,7 @@ defmodule Mediasoup.PipeTransport do
     GenServer.call(pid, {:produce_data, [option]})
   end
 
-  def produce_data(transport, %{} = option) do
+  def produce_data(%PipeTransport{} = transport, %{} = option) do
     produce_data(transport, DataProducer.Options.from_map(option))
   end
 
diff --git a/lib/plain_transport.ex b/lib/plain_transport.ex
index 83c2d99f..2ba5ede7 100644
--- a/lib/plain_transport.ex
+++ b/lib/plain_transport.ex
@@ -191,7 +191,7 @@ defmodule Mediasoup.PlainTransport do
     GenServer.call(pid, {:produce, [option]})
   end
 
-  def produce(transport, %{} = option) do
+  def produce(%PlainTransport{} = transport, %{} = option) do
     produce(transport, Producer.Options.from_map(option))
   end
 
@@ -205,7 +205,7 @@ defmodule Mediasoup.PlainTransport do
     GenServer.call(pid, {:consume, [option]})
   end
 
-  def consume(transport, option) do
+  def consume(%PlainTransport{} = transport, option) do
     consume(transport, Consumer.Options.from_map(option))
   end
 
diff --git a/lib/router.ex b/lib/router.ex
index 4bfb097b..6245f110 100644
--- a/lib/router.ex
+++ b/lib/router.ex
@@ -130,7 +130,7 @@ defmodule Mediasoup.Router do
     GenServer.call(pid, {:create_webrtc_transport, [option]})
   end
 
-  def create_webrtc_transport(router, %{} = option) do
+  def create_webrtc_transport(%Router{} = router, %{} = option) do
     create_webrtc_transport(router, WebRtcTransport.Options.from_map(option))
   end
 
@@ -148,7 +148,7 @@ defmodule Mediasoup.Router do
     GenServer.call(pid, {:create_plain_transport, [option]})
   end
 
-  def create_plain_transport(router, %{} = option) do
+  def create_plain_transport(%Router{} = router, %{} = option) do
     create_plain_transport(router, Mediasoup.PlainTransport.Options.from_map(option))
   end
 
diff --git a/lib/webrtc_transport.ex b/lib/webrtc_transport.ex
index 132268ca..76236ac6 100644
--- a/lib/webrtc_transport.ex
+++ b/lib/webrtc_transport.ex
@@ -229,7 +229,7 @@ defmodule Mediasoup.WebRtcTransport do
     GenServer.call(pid, {:consume, [option]})
   end
 
-  def consume(transport, option) do
+  def consume(%WebRtcTransport{} = transport, option) do
     consume(transport, Consumer.Options.from_map(option))
   end
 
@@ -243,7 +243,7 @@ defmodule Mediasoup.WebRtcTransport do
     GenServer.call(pid, {:consume_data, [option]})
   end
 
-  def consume_data(transport, option) do
+  def consume_data(%WebRtcTransport{} = transport, option) do
     consume_data(transport, DataConsumer.Options.from_map(option))
   end
 
@@ -257,7 +257,7 @@ defmodule Mediasoup.WebRtcTransport do
     GenServer.call(pid, {:produce, [option]})
   end
 
-  def produce(transport, %{} = option) do
+  def produce(%WebRtcTransport{} = transport, %{} = option) do
     produce(transport, Producer.Options.from_map(option))
   end
 
@@ -271,7 +271,7 @@ defmodule Mediasoup.WebRtcTransport do
     GenServer.call(pid, {:produce_data, [option]})
   end
 
-  def produce_data(transport, %{} = option) do
+  def produce_data(%WebRtcTransport{} = transport, %{} = option) do
     produce_data(transport, DataProducer.Options.from_map(option))
   end