diff --git a/build/test/plugins/inline-fs-test.js b/build/test/plugins/inline-fs-test.js
index 8637ccc41162..7b7ac01f7a79 100644
--- a/build/test/plugins/inline-fs-test.js
+++ b/build/test/plugins/inline-fs-test.js
@@ -342,17 +342,18 @@ describeSkipOnWindows('inline-fs', () => {
       it('warns and skips when missing encoding', async () => {
         const content = `const myTextContent = fs.readFileSync('${tmpPath}');`;
         const result = await inlineFs(content, filepath);
-        expect(result).toEqual({
-          code: null,
-          warnings: [{
-            text: 'fs.readFileSync() must have two arguments',
-            location: {
-              file: filepath,
-              line: 1,
-              column: 22,
-            },
-          }],
+
+        // These expectations are deconstructed because the warning text can have slight
+        // variations depending on the node version (18 vs 20).
+        // TODO: Use a simpler expectation when support for Node 18 is dropped.
+        expect(result.code).toBeNull();
+        expect(result.warnings).toHaveLength(1);
+        expect(result.warnings[0].location).toEqual({
+          file: filepath,
+          line: 1,
+          column: 22,
         });
+        expect(result.warnings[0].text).toMatch(/^fs\.readFileSync\(\) must have two arguments/);
       });
 
       it('warns and skips on unsupported encoding', async () => {