diff --git a/packages/better-auth/src/oauth2/link-account.ts b/packages/better-auth/src/oauth2/link-account.ts
index 069f746bcf..0637b49fb5 100644
--- a/packages/better-auth/src/oauth2/link-account.ts
+++ b/packages/better-auth/src/oauth2/link-account.ts
@@ -102,6 +102,7 @@ export async function handleOAuthUserInfo(
 			.createOAuthUser(
 				{
 					...userInfo,
+					email: userInfo.email.toLowerCase(),
 					id: undefined,
 				},
 				{