diff --git a/src/pipecat/frames/frames.py b/src/pipecat/frames/frames.py
index e0823e611..0038fcea9 100644
--- a/src/pipecat/frames/frames.py
+++ b/src/pipecat/frames/frames.py
@@ -407,11 +407,15 @@ class DTMFFrame(DataFrame):
 class InputDTMFFrame(DTMFFrame):
     """A DTMF button input"""
 
+    pass
+
 
 @dataclass
 class OutputDTMFFrame(DTMFFrame):
     """A DTMF button output"""
 
+    pass
+
 
 #
 # System frames