diff --git a/sbv2_core/src/nlp.rs b/sbv2_core/src/nlp.rs
index e4c24d3..253edb6 100644
--- a/sbv2_core/src/nlp.rs
+++ b/sbv2_core/src/nlp.rs
@@ -16,9 +16,9 @@ pub fn cleaned_text_to_sequence(
 ) -> (Vec<i32>, Vec<i32>, Vec<i32>) {
     let phones: Vec<i32> = cleaned_phones
         .iter()
-        .map(|phone| SYMBOL_TO_ID.get(phone).unwrap())
+        .map(|phone| *SYMBOL_TO_ID.get(phone).unwrap())
         .collect();
-    let tones: Vec<i32> = tones.iter().map(|tone| tone + 6).collect();
+    let tones: Vec<i32> = tones.iter().map(|tone| *tone + 6).collect();
     let lang_ids: Vec<i32> = vec![1; phones.len()];
     (phones, tones, lang_ids)
 }