diff --git a/media/libmediatranscoding/aidl/android/media/TranscodingRequestParcel.aidl b/media/libmediatranscoding/aidl/android/media/TranscodingRequestParcel.aidl
index b130a88..8e32269 100644
--- a/media/libmediatranscoding/aidl/android/media/TranscodingRequestParcel.aidl
+++ b/media/libmediatranscoding/aidl/android/media/TranscodingRequestParcel.aidl
@@ -74,7 +74,7 @@
     boolean isForTesting = false;
 
     /**
-     * Test configuration. This is only valid when isForTesting is set to true.
+     * Test configuration. This will be available only when isForTesting is set to true.
      */
-    TranscodingTestConfig testConfig;
+     @nullable TranscodingTestConfig testConfig;
 }
diff --git a/services/mediatranscoding/SimulatedTranscoder.cpp b/services/mediatranscoding/SimulatedTranscoder.cpp
index cdced2d..5aa325f 100644
--- a/services/mediatranscoding/SimulatedTranscoder.cpp
+++ b/services/mediatranscoding/SimulatedTranscoder.cpp
@@ -50,8 +50,8 @@
 void SimulatedTranscoder::start(
         ClientIdType clientId, JobIdType jobId, const TranscodingRequestParcel& request,
         const std::shared_ptr<ITranscodingClientCallback>& /*clientCallback*/) {
-    if (request.testConfig.processingTotalTimeMs > 0) {
-        mJobProcessingTimeMs = request.testConfig.processingTotalTimeMs;
+    if (request.testConfig.has_value() && request.testConfig->processingTotalTimeMs > 0) {
+        mJobProcessingTimeMs = request.testConfig->processingTotalTimeMs;
     }
     ALOGV("%s: job {%d}: processingTime: %lld", __FUNCTION__, jobId,
           (long long)mJobProcessingTimeMs);