diff --git a/src/main.cc b/src/main.cc
index bbe04c98..3f40320c 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -243,7 +243,7 @@ main(int argc, char** argv) {
 
     while (!control->is_shutdown_completed()) {
       if (control->is_shutdown_received())
-	control->handle_shutdown();
+        control->handle_shutdown();
 
       control->inc_tick();