diff --git a/media/libmedia/IStreamSource.cpp b/media/libmedia/IStreamSource.cpp
index 78d810d..68ffca8 100644
--- a/media/libmedia/IStreamSource.cpp
+++ b/media/libmedia/IStreamSource.cpp
@@ -32,6 +32,9 @@
 // static
 const char *const IStreamListener::kKeyDiscontinuityMask = "discontinuity-mask";
 
+// static
+const char *const IStreamListener::kKeyMediaTimeUs = "media-time-us";
+
 enum {
     // IStreamSource
     SET_LISTENER = IBinder::FIRST_CALL_TRANSACTION,