diff --git a/include/grpc++/security/credentials.h b/include/grpc++/security/credentials.h
index 4d64b5e2273..e0806c0b7b4 100644
--- a/include/grpc++/security/credentials.h
+++ b/include/grpc++/security/credentials.h
@@ -83,7 +83,7 @@ class ChannelCredentials : private GrpcLibrary {
 /// authenticate with a server for a given call on a channel.
 ///
 /// \see http://www.grpc.io/docs/guides/auth.html
-class CallCredentials {
+class CallCredentials : private GrpcLibrary {
  public:
   CallCredentials();
   ~CallCredentials();