diff --git a/um_audio/src/__fixtures__/mp3_with_id3v2.bin b/um_audio/src/__fixtures__/mp3_with_id3v2.bin
new file mode 100644
index 0000000..d3b47e6
Binary files /dev/null and b/um_audio/src/__fixtures__/mp3_with_id3v2.bin differ
diff --git a/um_audio/src/lib.rs b/um_audio/src/lib.rs
index 883d45b..9a44b30 100644
--- a/um_audio/src/lib.rs
+++ b/um_audio/src/lib.rs
@@ -129,3 +129,15 @@ pub fn detect_audio_type(buffer: &[u8]) -> Result<AudioType, AudioError> {
 
     Ok(AudioType::Unknown)
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::{detect_audio_type, AudioType};
+
+    #[test]
+    fn test_mp3() {
+        let mp3_data = include_bytes!("__fixtures__/mp3_with_id3v2.bin");
+        let result = detect_audio_type(mp3_data).expect("failed to parse mp3");
+        assert_eq!(result, AudioType::MP3);
+    }
+}
diff --git a/um_audio/src/metadata.rs b/um_audio/src/metadata.rs
index 0a3a6a9..17afd46 100644
--- a/um_audio/src/metadata.rs
+++ b/um_audio/src/metadata.rs
@@ -67,7 +67,7 @@ fn get_ape_v2_size(buffer: &[u8], offset: usize) -> Result<usize, AudioError> {
 
 pub fn get_header_metadata_size(buffer: &[u8], offset: usize) -> Result<usize, AudioError> {
     let len = get_id3_header_size(buffer, offset)?;
-    if len == 0 {
+    if len != 0 {
         Ok(len)
     } else {
         get_ape_v2_size(buffer, offset)