diff --git a/crates/voicevox_core/src/synthesizer.rs b/crates/voicevox_core/src/synthesizer.rs
index e027e3303..09dac36f5 100644
--- a/crates/voicevox_core/src/synthesizer.rs
+++ b/crates/voicevox_core/src/synthesizer.rs
@@ -474,7 +474,7 @@ mod inner {
             end: usize,
         ) -> Result<Vec<u8>> {
             // TODO: 44.1kHzなどの対応
-            let spec_segment = crop_with_margin(&audio, start..end)?;
+            let spec_segment = crop_with_margin(audio, start..end)?;
             let wave_with_margin = self
                 .render_audio_segment(spec_segment.to_owned(), audio.style_id)
                 .await?;