diff --git a/zenoh-ext/src/serialization.rs b/zenoh-ext/src/serialization.rs
index 877c74993e..2ed4e967df 100644
--- a/zenoh-ext/src/serialization.rs
+++ b/zenoh-ext/src/serialization.rs
@@ -462,7 +462,6 @@ mod tests {
     use std::ops::Range;
 
     use rand::{thread_rng, Rng};
-    use zenoh::time::{Timestamp, TimestampId, NTP64};
 
     use super::*;