diff --git a/backend/internal/service/org_chart_service.go b/backend/internal/service/org_chart_service.go
index 2e4a8e69..4c9952cd 100644
--- a/backend/internal/service/org_chart_service.go
+++ b/backend/internal/service/org_chart_service.go
@@ -185,7 +185,7 @@ func (s *orgChartService) ensureOrgPath(ctx context.Context, rootTenantID string
 				Type:     domain.TenantTypeUserGroup,
 				ParentID: &currentParentID,
 				Name:     part,
-				Slug:     "ug-" + unitID[:8],
+				Slug:     fmt.Sprintf("ug-%s", unitID[:8]),
 				Status:   domain.TenantStatusActive,
 			}
 			if err := s.tenantRepo.Create(ctx, newTenant); err != nil {