diff --git a/media/libmediaplayerservice/Crypto.cpp b/media/libmediaplayerservice/Crypto.cpp
index f639193..147d35f 100644
--- a/media/libmediaplayerservice/Crypto.cpp
+++ b/media/libmediaplayerservice/Crypto.cpp
@@ -89,7 +89,7 @@
 
     // first check cache
     Vector<uint8_t> uuidVector;
-    uuidVector.appendArray(uuid, sizeof(uuid));
+    uuidVector.appendArray(uuid, sizeof(uuid[0]) * 16);
     ssize_t index = mUUIDToLibraryPathMap.indexOfKey(uuidVector);
     if (index >= 0) {
         if (loadLibraryForScheme(mUUIDToLibraryPathMap[index], uuid)) {