diff --git a/packages/core/fraction.mjs b/packages/core/fraction.mjs
index 2e3bc68ea..076fbadf6 100644
--- a/packages/core/fraction.mjs
+++ b/packages/core/fraction.mjs
@@ -126,6 +126,8 @@ export const lcm = (...fractions) => {
   );
 };
 
+export const isFraction = (x) => x instanceof Fraction;
+
 fraction._original = Fraction;
 
 export default fraction;
diff --git a/packages/core/pattern.mjs b/packages/core/pattern.mjs
index 2991cffea..196248eba 100644
--- a/packages/core/pattern.mjs
+++ b/packages/core/pattern.mjs
@@ -5,8 +5,7 @@ This program is free software: you can redistribute it and/or modify it under th
 */
 
 import TimeSpan from './timespan.mjs';
-import Fraction, { lcm } from './fraction.mjs';
-import FractionClass from 'fraction.js';
+import Fraction, {isFraction, lcm } from './fraction.mjs';
 import Hap from './hap.mjs';
 import State from './state.mjs';
 import { unionWithObj } from './value.mjs';
@@ -27,7 +26,6 @@ import {
 } from './util.mjs';
 import drawLine from './drawLine.mjs';
 import { logger } from './logger.mjs';
-import fraction from './fraction.mjs';
 
 let stringParser;
 
@@ -1001,7 +999,7 @@ addToPrototype('weaveWith', function (t, ...funcs) {
 // compose matrix functions
 
 function _nonArrayObject(x) {
-  return !Array.isArray(x) && typeof x === 'object' && !(x instanceof FractionClass);
+  return !Array.isArray(x) && typeof x === 'object' && !isFraction(x);
 }
 function _composeOp(a, b, func) {
   if (_nonArrayObject(a) || _nonArrayObject(b)) {
diff --git a/packages/core/test/pattern.test.mjs b/packages/core/test/pattern.test.mjs
index 3b6619b56..1df5c8776 100644
--- a/packages/core/test/pattern.test.mjs
+++ b/packages/core/test/pattern.test.mjs
@@ -877,7 +877,7 @@ describe('Pattern', () => {
           .squeezeJoin()
           .queryArc(3, 4)
           .map((x) => x.value),
-      ).toStrictEqual([3]);
+      ).toStrictEqual([Fraction(3)]);
     });
   });
   describe('ply', () => {