diff --git a/src/babel.rs b/src/babel.rs
index 9e2b6de..17aedc2 100644
--- a/src/babel.rs
+++ b/src/babel.rs
@@ -145,7 +145,8 @@ impl Decoder for Codec {
             _ => {
                 // unrecoginized body type, silently drop
                 trace!("Dropping unrecognized tlv");
-                src.advance(header.body_length as usize - 1);
+                // We already read 2 bytes
+                src.advance(header.body_length as usize - 2);
                 self.reset();
                 return Ok(None);
             }