diff --git a/server/start.go b/server/start.go
index 35b2409c2648..99526af2d932 100644
--- a/server/start.go
+++ b/server/start.go
@@ -758,7 +758,7 @@ func testnetify(ctx *Context, testnetAppCreator types.AppCreator, db dbm.DB, tra
 	}
 
 	emptyAddrBook := []byte("{}")
-	if err := os.WriteFile(addrBookPath, emptyAddrBook, 0644); err != nil {
+	if err := os.WriteFile(addrBookPath, emptyAddrBook, 0o644); err != nil {
 		return nil, fmt.Errorf("failed to create empty addrbook.json: %w", err)
 	}