diff --git a/media/libmediaplayerservice/Drm.cpp b/media/libmediaplayerservice/Drm.cpp
index ac948a6..81dad41 100644
--- a/media/libmediaplayerservice/Drm.cpp
+++ b/media/libmediaplayerservice/Drm.cpp
@@ -46,7 +46,6 @@
 KeyedVector<Vector<uint8_t>, String8> Drm::mUUIDToLibraryPathMap;
 KeyedVector<String8, wp<SharedLibrary> > Drm::mLibraryPathToOpenLibraryMap;
 Mutex Drm::mMapLock;
-Mutex Drm::mLock;
 
 static bool operator<(const Vector<uint8_t> &lhs, const Vector<uint8_t> &rhs) {
     if (lhs.size() < rhs.size()) {
diff --git a/media/libmediaplayerservice/Drm.h b/media/libmediaplayerservice/Drm.h
index 2997da1..0e1eb2c 100644
--- a/media/libmediaplayerservice/Drm.h
+++ b/media/libmediaplayerservice/Drm.h
@@ -134,7 +134,7 @@
     virtual void binderDied(const wp<IBinder> &the_late_who);
 
 private:
-    static Mutex mLock;
+    mutable Mutex mLock;
 
     status_t mInitCheck;