diff --git a/FirebaseCore/Sources/FIRComponentContainerInternal.h b/FirebaseCore/Sources/FIRComponentContainerInternal.h
index 13c33e8c1d4..169e181f9bd 100644
--- a/FirebaseCore/Sources/FIRComponentContainerInternal.h
+++ b/FirebaseCore/Sources/FIRComponentContainerInternal.h
@@ -29,7 +29,8 @@ NS_ASSUME_NONNULL_BEGIN
 
 /// Retrieves an instance that conforms to the specified protocol. This will return `nil` if the
 /// protocol wasn't registered, or if the instance couldn't be instantiated for the provided app.
-- (nullable id)instanceForProtocol:(Protocol *)protocol NS_SWIFT_NAME(instance(for:));
+- (nullable id)instanceForProtocol:(Protocol *)protocol
+    NS_SWIFT_UNAVAILABLE("Use `instance(for:)` from the FirebaseCoreExtension module instead.");
 
 /// Instantiates all the components that have registered as "eager" after initialization.
 - (void)instantiateEagerComponents;