diff --git a/core/src/backend/audio.rs b/core/src/backend/audio.rs
index d00338cbc5d9..c7a3a42de304 100644
--- a/core/src/backend/audio.rs
+++ b/core/src/backend/audio.rs
@@ -98,11 +98,8 @@ pub trait AudioBackend: Downcast {
 
     /// Starts playing a "stream" sound, which is an audio stream that is distributed
     /// among the frames of a Flash MovieClip.
-    ///
-    /// NOTE: `clip_frame` is no longer used on any backend.
     fn start_stream(
         &mut self,
-        clip_frame: u16,
         clip_data: crate::tag_utils::SwfSlice,
         handle: &swf::SoundStreamHead,
     ) -> Result<SoundInstanceHandle, DecodeError>;
@@ -267,7 +264,6 @@ impl AudioBackend for NullAudioBackend {
 
     fn start_stream(
         &mut self,
-        _clip_frame: u16,
         _clip_data: crate::tag_utils::SwfSlice,
         _handle: &swf::SoundStreamHead,
     ) -> Result<SoundInstanceHandle, DecodeError> {
@@ -536,7 +532,7 @@ impl<'gc> AudioManager<'gc> {
         stream_info: &swf::SoundStreamHead,
     ) -> Option<SoundInstanceHandle> {
         if self.sounds.len() < Self::MAX_SOUNDS {
-            let handle = audio.start_stream(clip_frame, data, stream_info).ok()?;
+            let handle = audio.start_stream(data, stream_info).ok()?;
             let instance = SoundInstance {
                 sound: None,
                 instance: handle,
diff --git a/core/src/backend/audio/mixer.rs b/core/src/backend/audio/mixer.rs
index db08b1e29171..081865fe5c1b 100644
--- a/core/src/backend/audio/mixer.rs
+++ b/core/src/backend/audio/mixer.rs
@@ -554,7 +554,6 @@ impl AudioMixer {
     /// Starts a timeline audio stream.
     pub fn start_stream(
         &mut self,
-        _clip_frame: u16,
         clip_data: SwfSlice,
         stream_info: &swf::SoundStreamHead,
     ) -> Result<SoundInstanceHandle, DecodeError> {
@@ -1089,11 +1088,10 @@ macro_rules! impl_audio_mixer_backend {
         #[inline]
         fn start_stream(
             &mut self,
-            clip_frame: u16,
             clip_data: $crate::tag_utils::SwfSlice,
             stream_info: &swf::SoundStreamHead,
         ) -> Result<SoundInstanceHandle, DecodeError> {
-            self.$mixer.start_stream(clip_frame, clip_data, stream_info)
+            self.$mixer.start_stream(clip_data, stream_info)
         }
 
         #[inline]