diff --git a/media/libmediaplayerservice/HDCP.h b/media/libmediaplayerservice/HDCP.h
index 26ddc86..83c61b5 100644
--- a/media/libmediaplayerservice/HDCP.h
+++ b/media/libmediaplayerservice/HDCP.h
@@ -24,7 +24,7 @@
 namespace android {
 
 struct HDCP : public BnHDCP {
-    HDCP(bool createEncryptionModule);
+    explicit HDCP(bool createEncryptionModule);
     virtual ~HDCP();
 
     virtual status_t setObserver(const sp<IHDCPObserver> &observer);