diff --git a/tests/reference-day-care.spec.ts b/tests/reference-day-care.spec.ts
index 8ddfa17..8bfd886 100644
--- a/tests/reference-day-care.spec.ts
+++ b/tests/reference-day-care.spec.ts
@@ -190,8 +190,15 @@ test.describe("Day-Care routines against the cartridge", () => {
     ...extra,
   });
 
-  // A small deterministic generator for the cases.
-  let seed = 0x5eed;
+  // A small deterministic generator for the cases, seeded by each test from
+  // its own title (FNV-1a): a test's cases are the same whichever tests ran
+  // before it in the worker, and in every browser.
+  let seed = 0;
+  test.beforeEach(({}, testInfo) => {
+    seed = 0x811c9dc5;
+    for (const character of testInfo.title)
+      seed = Math.imul(seed ^ character.charCodeAt(0), 0x01000193) >>> 0;
+  });
   const next = (limit = 256) => {
     seed = (Math.imul(seed, 1664525) + 1013904223) >>> 0;
     return (seed >>> 8) % limit;