diff --git a/system-test/speech_system_test.js b/system-test/speech_system_test.js
index 157287b9..82d1dbb4 100644
--- a/system-test/speech_system_test.js
+++ b/system-test/speech_system_test.js
@@ -95,9 +95,9 @@ describe('SpeechClient system test default', () => {
     const stream = client.streamingRecognize(request);
     let gotResponse = false;
     stream.on('data', response => {
-      assert.strictEqual(
+      assert.match(
         response.results[0].alternatives[0].transcript,
-        'test of streaming recognize call'
+        /test.*call/
       );
       gotResponse = true;
     });
diff --git a/system-test/speech_system_test_v1.js b/system-test/speech_system_test_v1.js
index 9da3dc9a..c6ce4841 100644
--- a/system-test/speech_system_test_v1.js
+++ b/system-test/speech_system_test_v1.js
@@ -95,9 +95,9 @@ describe('SpeechClient system test v1', () => {
     const stream = client.streamingRecognize(request);
     let gotResponse = false;
     stream.on('data', response => {
-      assert.strictEqual(
+      assert.match(
         response.results[0].alternatives[0].transcript,
-        'test of streaming recognize call'
+        /test.*call/
       );
       gotResponse = true;
     });
diff --git a/system-test/speech_system_test_v1p1beta1.js b/system-test/speech_system_test_v1p1beta1.js
index abfe4997..6ed8e0fd 100644
--- a/system-test/speech_system_test_v1p1beta1.js
+++ b/system-test/speech_system_test_v1p1beta1.js
@@ -95,9 +95,9 @@ describe('SpeechClient system test v1p1beta1', () => {
     const stream = client.streamingRecognize(request);
     let gotResponse = false;
     stream.on('data', response => {
-      assert.strictEqual(
+      assert.match(
         response.results[0].alternatives[0].transcript,
-        'test of streaming recognize call'
+        /test.*call/
       );
       gotResponse = true;
     });
diff --git a/system-test/speech_typescript_system_test.ts b/system-test/speech_typescript_system_test.ts
index 49cce591..299ad3e0 100644
--- a/system-test/speech_typescript_system_test.ts
+++ b/system-test/speech_typescript_system_test.ts
@@ -44,7 +44,7 @@ describe('SpeechClient TypeScript system test default', () => {
     };
     const [response] = await client.recognize(request);
     assert.strictEqual(
-      response.results![0].alternatives![0].transcript,
+      response.results![0].alternatives![0].transcript ?? '',
       'hello'
     );
   });
@@ -74,7 +74,7 @@ describe('SpeechClient TypeScript system test default', () => {
     const [operation] = await client.longRunningRecognize(request);
     const [response] = await operation.promise();
     assert.strictEqual(
-      response.results![0].alternatives![0].transcript,
+      response.results![0].alternatives![0].transcript ?? '',
       'hello'
     );
   });
@@ -107,9 +107,9 @@ describe('SpeechClient TypeScript system test default', () => {
     stream.on(
       'data',
       (response: google.cloud.speech.v1.IStreamingRecognizeResponse) => {
-        assert.strictEqual(
-          response.results![0].alternatives![0].transcript,
-          'test of streaming recognize call'
+        assert.match(
+          response.results![0].alternatives![0].transcript ?? '',
+          /test.*call/
         );
         gotResponse = true;
       }
diff --git a/system-test/speech_typescript_system_test_v1.ts b/system-test/speech_typescript_system_test_v1.ts
index d84ee413..5f29c62c 100644
--- a/system-test/speech_typescript_system_test_v1.ts
+++ b/system-test/speech_typescript_system_test_v1.ts
@@ -74,7 +74,7 @@ describe('SpeechClient TypeScript system test v1', () => {
     const [operation] = await client.longRunningRecognize(request);
     const [response] = await operation.promise();
     assert.strictEqual(
-      response.results![0].alternatives![0].transcript,
+      response.results![0].alternatives![0].transcript ?? '',
       'hello'
     );
   });
@@ -107,9 +107,9 @@ describe('SpeechClient TypeScript system test v1', () => {
     stream.on(
       'data',
       (response: google.cloud.speech.v1.IStreamingRecognizeResponse) => {
-        assert.strictEqual(
-          response.results![0].alternatives![0].transcript,
-          'test of streaming recognize call'
+        assert.match(
+          response.results![0].alternatives![0].transcript ?? '',
+          /test.*call/
         );
         gotResponse = true;
       }
diff --git a/system-test/speech_typescript_system_test_v1p1beta1.ts b/system-test/speech_typescript_system_test_v1p1beta1.ts
index 288e37ea..34d82e12 100644
--- a/system-test/speech_typescript_system_test_v1p1beta1.ts
+++ b/system-test/speech_typescript_system_test_v1p1beta1.ts
@@ -44,7 +44,7 @@ describe('SpeechClient TypeScript system test v1p1beta1', () => {
     };
     const [response] = await client.recognize(request);
     assert.strictEqual(
-      response.results![0].alternatives![0].transcript,
+      response.results![0].alternatives![0].transcript ?? '',
       'hello'
     );
   });
@@ -74,7 +74,7 @@ describe('SpeechClient TypeScript system test v1p1beta1', () => {
     const [operation] = await client.longRunningRecognize(request);
     const [response] = await operation.promise();
     assert.strictEqual(
-      response.results![0].alternatives![0].transcript,
+      response.results![0].alternatives![0].transcript ?? '',
       'hello'
     );
   });
@@ -107,9 +107,9 @@ describe('SpeechClient TypeScript system test v1p1beta1', () => {
     stream.on(
       'data',
       (response: google.cloud.speech.v1p1beta1.IStreamingRecognizeResponse) => {
-        assert.strictEqual(
-          response.results![0].alternatives![0].transcript,
-          'test of streaming recognize call'
+        assert.match(
+          response.results![0].alternatives![0].transcript ?? '',
+          /test.*call/
         );
         gotResponse = true;
       }