diff --git a/include/behaviour_control/complementary_filter.h b/include/behaviour_control/complementary_filter.h
index 357bbef..8300132 100644
--- a/include/behaviour_control/complementary_filter.h
+++ b/include/behaviour_control/complementary_filter.h
@@ -1,3 +1,5 @@
+#pragma once
+
 #include "vars.h"
 
 class ComplementaryFilter{