diff --git a/Runtime/Scripts/RtcAudioSource.cs b/Runtime/Scripts/RtcAudioSource.cs
index ef51273..27bbde7 100644
--- a/Runtime/Scripts/RtcAudioSource.cs
+++ b/Runtime/Scripts/RtcAudioSource.cs
@@ -32,8 +32,8 @@ public abstract class RtcAudioSource : IRtcSource, IDisposable
         /// </remarks>
         public abstract event Action<float[], int, int> AudioRead;
 
-#if UNITY_IOS && !UNITY_EDITOR
-        // iOS microphone sample rate is 24k
+#if (UNITY_IOS || (UNITY_ANDROID && UNITY_6000_0_OR_NEWER)) && !UNITY_EDITOR
+        // iOS/Android(Unity 6000+) microphone sample rate is 24k
         public static uint DefaultMicrophoneSampleRate = 24000;
 
         public static uint DefaultSampleRate = 48000;