diff --git a/FirebaseDatabase/Sources/Login/FIRDatabaseConnectionContextProvider.h b/FirebaseDatabase/Sources/Login/FIRDatabaseConnectionContextProvider.h
index b4cd8320678..5f025e1b228 100644
--- a/FirebaseDatabase/Sources/Login/FIRDatabaseConnectionContextProvider.h
+++ b/FirebaseDatabase/Sources/Login/FIRDatabaseConnectionContextProvider.h
@@ -56,7 +56,8 @@ NS_ASSUME_NONNULL_BEGIN
 
 @end
 
-@interface FIRDatabaseConnectionContextProvider : NSObject
+@interface FIRDatabaseConnectionContextProvider
+    : NSObject <FIRDatabaseConnectionContextProvider>
 
 + (id<FIRDatabaseConnectionContextProvider>)
     contextProviderWithAuth:(nullable id<FIRAuthInterop>)auth