diff --git a/discord/guild.py b/discord/guild.py
index 87a29596a..57ea2273b 100644
--- a/discord/guild.py
+++ b/discord/guild.py
@@ -2927,7 +2927,7 @@ class Guild(Hashable):
         if description is not MISSING:
             payload['description'] = description
         if welcome_channels is not MISSING:
-            channels = [channel.to_dict() for channel in welcome_channels] if welcome_channels else []
+            channels = [channel._to_dict() for channel in welcome_channels] if welcome_channels else []
             payload['welcome_channels'] = channels
 
         if payload:
diff --git a/discord/welcome_screen.py b/discord/welcome_screen.py
index 371332b80..c026348e5 100644
--- a/discord/welcome_screen.py
+++ b/discord/welcome_screen.py
@@ -178,7 +178,7 @@ class WelcomeScreen:
         if description is not MISSING:
             payload['description'] = description
         if welcome_channels is not MISSING:
-            channels = [channel.to_dict() for channel in welcome_channels] if welcome_channels else []
+            channels = [channel._to_dict() for channel in welcome_channels] if welcome_channels else []
             payload['welcome_channels'] = channels
 
         if payload: