diff --git a/media/libmedia/MediaResource.cpp b/media/libmedia/MediaResource.cpp
index 8be01bc..eea2c43 100644
--- a/media/libmedia/MediaResource.cpp
+++ b/media/libmedia/MediaResource.cpp
@@ -50,7 +50,7 @@
 
 String8 MediaResource::toString() const {
     String8 str;
-    str.appendFormat("%s/%s:%llu", mType.string(), mSubType.string(), mValue);
+    str.appendFormat("%s/%s:%llu", mType.string(), mSubType.string(), (unsigned long long)mValue);
     return str;
 }