diff --git a/build.rs b/build.rs
index 9357ea4..ca31c8a 100644
--- a/build.rs
+++ b/build.rs
@@ -534,7 +534,7 @@ impl AudioFile {
         format!(
             "const {}: AudioFile = AudioFile {{
             path: {:?},
-            duration: {},
+            duration: {}f32,
         }};",
             self.snake_case().to_uppercase(),
             self.path,