diff --git a/test/parallel/test-max-old-space-size-percentage.js b/test/parallel/test-max-old-space-size-percentage.js
index b84344ddb3988d..c5071d2f959ce3 100644
--- a/test/parallel/test-max-old-space-size-percentage.js
+++ b/test/parallel/test-max-old-space-size-percentage.js
@@ -41,7 +41,7 @@ invalidPercentages.forEach((input) => {
     `--max-old-space-size-percentage=${input[0]}`,
   ], { stdio: ['pipe', 'pipe', 'pipe'] });
   assert.notStrictEqual(result.status, 0, `Expected non-zero exit for invalid input ${input[0]}`);
-  assert(input[1].test(result.stderr.toString()), `Unexpected error message for invalid input ${input[0]}`);
+  assert.match(result.stderr.toString(), input[1]);
 });
 
 // Test NODE_OPTIONS with valid percentages
@@ -61,7 +61,7 @@ invalidPercentages.forEach((input) => {
     env: { ...process.env, NODE_OPTIONS: `--max-old-space-size-percentage=${input[0]}` }
   });
   assert.notStrictEqual(result.status, 0, `NODE_OPTIONS: Expected non-zero exit for invalid input ${input[0]}`);
-  assert(input[1].test(result.stderr.toString()), `NODE_OPTIONS: Unexpected error message for invalid input ${input[0]}`);
+  assert.match(result.stderr.toString(), input[1]);
 });
 
 // Test percentage calculation validation
diff --git a/test/parallel/test-tls-junk-server.js b/test/parallel/test-tls-junk-server.js
index ff491d11a18c3e..a349c35494588b 100644
--- a/test/parallel/test-tls-junk-server.js
+++ b/test/parallel/test-tls-junk-server.js
@@ -28,7 +28,7 @@ server.listen(0, common.mustCall(function() {
     expectedErrorMessage = new RegExp('packet length too long');
   };
   req.once('error', common.mustCall(function(err) {
-    assert(expectedErrorMessage.test(err.message));
+    assert.match(err.message, expectedErrorMessage);
     server.close();
   }));
 }));