diff --git a/crates/locallibrary/tests/it/plugins.rs b/crates/locallibrary/tests/it/plugins.rs
index 9a2dc6461..023a2084c 100644
--- a/crates/locallibrary/tests/it/plugins.rs
+++ b/crates/locallibrary/tests/it/plugins.rs
@@ -196,9 +196,10 @@ impl Fixture {
     }
 
     /// The echo plugin, its exporter declaring the test plugin's own options: `outside`, a file
-    /// it says it writes in place of the export, and `extra`, one it writes besides.
+    /// it says it writes in place of the export, `extra`, one it writes besides, and `sizes`, the
+    /// sizes of the files it says it writes.
     fn exporting() -> Fixture {
-        let options = "options = { type = \"object\", properties = { extra = { type = \"string\" }, outside = { type = \"string\" } } }";
+        let options = "options = { type = \"object\", properties = { extra = { type = \"string\" }, outside = { type = \"string\" }, sizes = { type = \"array\", items = { type = \"integer\" } } } }";
         let manifest = ECHO.replace("extension = \"m3u\"\n", &format!("extension = \"m3u\"\n{options}\n"));
         assert_ne!(manifest, ECHO);
         Fixture::new(|dir| vec![spec(dir, &manifest, &[])], Options::default())
diff --git a/crates/locallibrary/tests/it/plugins/exports.rs b/crates/locallibrary/tests/it/plugins/exports.rs
index a2a7cb171..22d090ce4 100644
--- a/crates/locallibrary/tests/it/plugins/exports.rs
+++ b/crates/locallibrary/tests/it/plugins/exports.rs
@@ -197,7 +197,7 @@ fn an_export_writes_out_only_what_its_exporter_says(tc: hegel::TestCase) {
 #[hegel::test(test_cases = 20, suppress_health_check = [hegel::HealthCheck::TooSlow])]
 fn an_exports_sizes_that_overflow_are_refused(tc: hegel::TestCase) {
     use hegel::generators as gs;
-    let f = Fixture::echo();
+    let f = Fixture::exporting();
     let size = hegel::one_of!(gs::integers::<u64>().min_value(u64::MAX - 1000), gs::integers::<u64>().max_value(1000));
     let sizes: Vec<u64> = tc.draw(gs::vecs(size).min_size(1).max_size(4));
     let out = f._dir.path().join("out");