diff --git a/media/ndk/NdkMediaDrm.cpp b/media/ndk/NdkMediaDrm.cpp
index 6d10f1c..5597488 100644
--- a/media/ndk/NdkMediaDrm.cpp
+++ b/media/ndk/NdkMediaDrm.cpp
@@ -309,6 +309,7 @@
     }
     String8 defaultUrl;
     DrmPlugin::KeyRequestType keyRequestType;
+    mObj->mKeyRequest.clear();
     status_t status = mObj->mDrm->getKeyRequest(*iter, mdInit, String8(mimeType),
             mdKeyType, mdOptionalParameters, mObj->mKeyRequest, defaultUrl,
             &keyRequestType);