diff --git a/packages/eval/test/evaluate.test.mjs b/packages/eval/test/evaluate.test.mjs
index 99c0c311..9fbedb20 100644
--- a/packages/eval/test/evaluate.test.mjs
+++ b/packages/eval/test/evaluate.test.mjs
@@ -3,7 +3,7 @@ import { evaluate, extend } from '../evaluate.mjs';
 import { mini } from '@strudel.cycles/mini';
 import * as strudel from '@strudel.cycles/core';
 
-const { cat } = strudel;
+const { fastcat } = strudel;
 
 extend({ mini }, strudel);
 
@@ -12,11 +12,11 @@ describe('evaluate', () => {
   it('Should evaluate strudel functions', async () => {
     assert.deepStrictEqual(await ev("pure('c3')"), ['c3']);
     assert.deepStrictEqual(await ev('cat(c3)'), ['c3']);
-    assert.deepStrictEqual(await ev('cat(c3, d3)'), ['c3', 'd3']);
+    assert.deepStrictEqual(await ev('fastcat(c3, d3)'), ['c3', 'd3']);
     assert.deepStrictEqual(await ev('slowcat(c3, d3)'), ['c3']);
   });
   it('Should be extendable', async () => {
-    extend({ myFunction: (...x) => cat(...x) });
+    extend({ myFunction: (...x) => fastcat(...x) });
     assert.deepStrictEqual(await ev('myFunction(c3, d3)'), ['c3', 'd3']);
   });
   it('Should evaluate simple double quoted mini notation', async () => {