diff --git a/src/auth/services/auth.service.ts b/src/auth/services/auth.service.ts
index 18d13f1..1e261e6 100644
--- a/src/auth/services/auth.service.ts
+++ b/src/auth/services/auth.service.ts
@@ -73,6 +73,12 @@ export class AuthService {
       throw new BadRequestException('USERS.EMAIL_ALREADY_SET');
     }
 
+    const existingUser = await this.userService.findUser({ email });
+
+    if (existingUser) {
+      throw new BadRequestException('USERS.EMAIL_ALREADY_TAKEN');
+    }
+
     return this.userService.setEmail(userId, email);
   }