diff --git a/packages/services/auth-service/src/application/services/auth.service.ts b/packages/services/auth-service/src/application/services/auth.service.ts
index d06cda0..7755326 100644
--- a/packages/services/auth-service/src/application/services/auth.service.ts
+++ b/packages/services/auth-service/src/application/services/auth.service.ts
@@ -141,11 +141,11 @@ export class AuthService {
     name: string,
     companyName: string,
   ) {
-    // Generate slug from company name
+    // Generate slug from company name (underscores for valid PostgreSQL schema names)
     const slug = companyName
       .toLowerCase()
-      .replace(/[^a-z0-9]+/g, '-')
-      .replace(/(^-|-$)/g, '')
+      .replace(/[^a-z0-9]+/g, '_')
+      .replace(/(^_|_$)/g, '')
       .slice(0, 40);
 
     // Check slug uniqueness