diff --git a/src/decoders/trx-ais/src/lib.rs b/src/decoders/trx-ais/src/lib.rs
index 1eb5bdbe..d6e66e1d 100644
--- a/src/decoders/trx-ais/src/lib.rs
+++ b/src/decoders/trx-ais/src/lib.rs
@@ -243,7 +243,7 @@ fn parse_frame(frame: RawFrame, channel: &str) -> Option<AisMessage> {
 
     let message_type = get_uint(&bits, 0, 6)? as u8;
     let repeat = get_uint(&bits, 6, 2)? as u8;
-    let mmsi = get_uint(&bits, 8, 30)? as u32;
+    let mmsi = get_uint(&bits, 8, 30)?;
 
     let mut msg = AisMessage {
         rig_id: None,