diff --git a/test/unit/beforeEach.js b/test/unit/beforeEach.js
index d47648e9..33e76e82 100644
--- a/test/unit/beforeEach.js
+++ b/test/unit/beforeEach.js
@@ -5,8 +5,10 @@ const sharp = require('../../');
 
 const usingCache = detectLibc.family !== detectLibc.MUSL;
 const usingSimd = !process.env.G_DEBUG;
+const concurrency = detectLibc.family === detectLibc.MUSL ? 1 : undefined;
 
 beforeEach(function () {
   sharp.cache(usingCache);
   sharp.simd(usingSimd);
+  sharp.concurrency(concurrency);
 });