diff --git a/collector/src/lib.rs b/collector/src/lib.rs
index 708d1c31e..9f06c6991 100644
--- a/collector/src/lib.rs
+++ b/collector/src/lib.rs
@@ -81,7 +81,6 @@ use janus_messages::{
     AggregateShareAad, BatchSelector, CollectionJobId, CollectionJobReq, CollectionJobResp,
     PartialBatchSelector, Query, Role, TaskId,
 };
-use mime;
 use prio::{
     codec::{Decode, Encode, ParameterizedDecode},
     vdaf,