diff --git a/test/parallel/test-worker-resource-limits.js b/test/parallel/test-worker-resource-limits.js
index ffda452f6c6335..f79c31b2a18793 100644
--- a/test/parallel/test-worker-resource-limits.js
+++ b/test/parallel/test-worker-resource-limits.js
@@ -35,10 +35,10 @@ if (!process.env.HAS_STARTED_WORKER) {
 assert.deepStrictEqual(resourceLimits, testResourceLimits);
 const array = [];
 while (true) {
-  // Leave 10% wiggle room here, and 20% on debug builds.
-  const wiggleRoom = common.buildType === 'Release' ? 1.1 : 1.2;
   const usedMB = v8.getHeapStatistics().used_heap_size / 1024 / 1024;
-  assert(usedMB < resourceLimits.maxOldGenerationSizeMb * wiggleRoom);
+  const maxReservedSize = resourceLimits.maxOldGenerationSizeMb +
+                          resourceLimits.maxYoungGenerationSizeMb;
+  assert(usedMB < maxReservedSize);
 
   let seenSpaces = 0;
   for (const { space_name, space_size } of v8.getHeapSpaceStatistics()) {