diff --git a/ui/app/config/views/mcpClientForm.tsx b/ui/app/config/views/mcpClientForm.tsx
index bc1208c5d..90ff2b3e8 100644
--- a/ui/app/config/views/mcpClientForm.tsx
+++ b/ui/app/config/views/mcpClientForm.tsx
@@ -113,7 +113,7 @@ const ClientForm: React.FC<ClientFormProps> = ({ client, open, onClose, onSaved
 					Validator.required(form.connection_string?.trim(), "Connection URL is required"),
 					Validator.pattern(
 						form.connection_string || "",
-						/^(http:\/\/|https:\/\/|env\.[A-Z_]+$)/,
+						/^(?:https?:\/\/.+|env\.[A-Z_]+)$/,
 						"Connection URL must start with http://, https://, or be an environment variable (env.VAR_NAME)",
 					),
 				]