diff --git a/server/src/lib/setup/config.ts b/server/src/lib/setup/config.ts
index 19c41e06c..ffbec3ab4 100644
--- a/server/src/lib/setup/config.ts
+++ b/server/src/lib/setup/config.ts
@@ -82,6 +82,7 @@ export interface TachiConfig {
 const isValidOauth2 = p.optional({
 	CLIENT_ID: "string",
 	CLIENT_SECRET: "string",
+	REDIRECT_URI: "string",
 });
 
 const err = p(config, {