diff --git a/src/core/tests/minhash.rs b/src/core/tests/minhash.rs
index 59eddeff4..ef3d720d8 100644
--- a/src/core/tests/minhash.rs
+++ b/src/core/tests/minhash.rs
@@ -14,6 +14,7 @@ use sourmash::sketch::minhash::{
 };
 use sourmash::sketch::Sketch;
 use sourmash::ScaledType;
+use sourmash::prelude::ToWriter;
 
 // TODO: use f64::EPSILON when we bump MSRV
 const EPSILON: f64 = 0.01;