diff --git a/EKF/ekf.h b/EKF/ekf.h
index d94e4f2b09..b23ca6c732 100644
--- a/EKF/ekf.h
+++ b/EKF/ekf.h
@@ -40,6 +40,8 @@
  *
  */
 
+#pragma once
+
 #include "estimator_interface.h"
 
 class Ekf : public EstimatorInterface
diff --git a/EKF/estimator_interface.h b/EKF/estimator_interface.h
index d240bdff6f..9f7e60874e 100644
--- a/EKF/estimator_interface.h
+++ b/EKF/estimator_interface.h
@@ -39,6 +39,8 @@
  *
  */
 
+#pragma once
+
 #include "common.h"
 #include "RingBuffer.h"