diff --git a/libs/storage/IMountService.cpp b/libs/storage/IMountService.cpp
index fd6e6e9..055dbb2 100644
--- a/libs/storage/IMountService.cpp
+++ b/libs/storage/IMountService.cpp
@@ -442,14 +442,13 @@
         reply.readExceptionCode();
     }
 
-    void mountObb(const String16& rawPath, const String16& canonicalPath, const String16& key,
+    void mountObb(const String16& rawPath, const String16& canonicalPath,
             const sp<IObbActionListener>& token, int32_t nonce, const sp<ObbInfo>& obbInfo)
     {
         Parcel data, reply;
         data.writeInterfaceToken(IMountService::getInterfaceDescriptor());
         data.writeString16(rawPath);
         data.writeString16(canonicalPath);
-        data.writeString16(key);
         data.writeStrongBinder(IInterface::asBinder(token));
         data.writeInt32(nonce);
         obbInfo->writeToParcel(&data);
diff --git a/libs/storage/include/storage/IMountService.h b/libs/storage/include/storage/IMountService.h
index 2463e02..5b07318 100644
--- a/libs/storage/include/storage/IMountService.h
+++ b/libs/storage/include/storage/IMountService.h
@@ -64,8 +64,8 @@
     virtual void shutdown(const sp<IMountShutdownObserver>& observer) = 0;
     virtual void finishMediaUpdate() = 0;
     virtual void mountObb(const String16& rawPath, const String16& canonicalPath,
-            const String16& key, const sp<IObbActionListener>& token,
-            const int32_t nonce, const sp<ObbInfo>& obbInfo) = 0;
+            const sp<IObbActionListener>& token, const int32_t nonce,
+            const sp<ObbInfo>& obbInfo) = 0;
     virtual void unmountObb(const String16& filename, const bool force,
             const sp<IObbActionListener>& token, const int32_t nonce) = 0;
     virtual bool isObbMounted(const String16& filename) = 0;