diff --git a/milli/src/update/settings.rs b/milli/src/update/settings.rs
index 569938ccf..be5a449b9 100644
--- a/milli/src/update/settings.rs
+++ b/milli/src/update/settings.rs
@@ -1671,7 +1671,7 @@ mod tests {
         let count = index
             .facet_id_string_docids
             .remap_key_type::<Bytes>()
-            .prefix_iter(&rtxn, &[0, 1, 0])
+            .prefix_iter(&rtxn, &[0, 0])
             .unwrap()
             .count();
         assert_eq!(count, 5);
@@ -1703,7 +1703,7 @@ mod tests {
         let count = index
             .facet_id_string_docids
             .remap_key_type::<Bytes>()
-            .prefix_iter(&rtxn, &[0, 1, 0])
+            .prefix_iter(&rtxn, &[0, 0])
             .unwrap()
             .count();
         assert_eq!(count, 5);