diff --git a/src/pipecat/services/ai_services.py b/src/pipecat/services/ai_services.py
index 0a03b2eaa..e49452d38 100644
--- a/src/pipecat/services/ai_services.py
+++ b/src/pipecat/services/ai_services.py
@@ -19,6 +19,7 @@ from pipecat.frames.frames import (
     EndFrame,
     ErrorFrame,
     Frame,
+    InterimTranscriptionFrame,
     LLMFullResponseEndFrame,
     StartFrame,
     StartInterruptionFrame,
@@ -291,8 +292,11 @@ class TTSService(AIService):
 
     async def process_frame(self, frame: Frame, direction: FrameDirection):
         await super().process_frame(frame, direction)
-
-        if isinstance(frame, TextFrame) and not isinstance(frame, TranscriptionFrame):
+        if (
+            isinstance(frame, TextFrame)
+            and not isinstance(frame, InterimTranscriptionFrame)
+            and not isinstance(frame, TranscriptionFrame)
+        ):
             await self._process_text_frame(frame)
         elif isinstance(frame, StartInterruptionFrame):
             await self._handle_interruption(frame, direction)