diff --git a/repos/os/src/hoitaja/cell_controller.h b/repos/os/src/hoitaja/cell_controller.h
index 94127a2d7d..f4d0a92c9b 100644
--- a/repos/os/src/hoitaja/cell_controller.h
+++ b/repos/os/src/hoitaja/cell_controller.h
@@ -12,6 +12,7 @@
  * under the terms of the GNU Affero General Public License version 3.
  */
 
+#pragma once
 #include <sandbox/child.h>
 
 namespace Hoitaja