diff --git a/docker/pusher.go b/docker/pusher.go
index d1e8c2485..95f9c21fc 100644
--- a/docker/pusher.go
+++ b/docker/pusher.go
@@ -210,7 +210,13 @@ func (n *Pusher) Push(ctx context.Context, f fn.Function) (digest string, err er
 	}
 	n.progressListener.Increment("Pushing function image to the registry")
 
-	b, err := json.Marshal(&credentials)
+	authConfig := types.AuthConfig{
+		Username:      credentials.Username,
+		Password:      credentials.Password,
+		ServerAddress: registry,
+	}
+
+	b, err := json.Marshal(&authConfig)
 	if err != nil {
 		return "", err
 	}