diff --git a/src/controls/QskLevelingSensor.h b/src/controls/QskLevelingSensor.h
index 84b15fc6..8aae2eee 100644
--- a/src/controls/QskLevelingSensor.h
+++ b/src/controls/QskLevelingSensor.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef QSK_LEVELING_SENSOR_H
+#define QSK_LEVELING_SENSOR_H
 
 #include <QskControl.h>
 #include <memory>
@@ -39,4 +40,6 @@ class QSK_EXPORT QskLevelingSensor : public QskControl
   private:
     class PrivateData;
     std::unique_ptr< PrivateData > m_data;
-};
\ No newline at end of file
+};
+
+#endif
\ No newline at end of file
diff --git a/src/controls/QskLevelingSensorSkinlet.h b/src/controls/QskLevelingSensorSkinlet.h
index c60a5084..9b5f7ba7 100644
--- a/src/controls/QskLevelingSensorSkinlet.h
+++ b/src/controls/QskLevelingSensorSkinlet.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef QSK_LEVELING_SENSOR_SKINLET_H
+#define QSK_LEVELING_SENSOR_SKINLET_H
 
 #include <QSGNode>
 #include <QskSkinlet.h>
@@ -50,3 +51,5 @@ class QSK_EXPORT QskLevelingSensorSkinlet : public QskSkinlet
     Q_REQUIRED_RESULT QSGNode* updateSubNode(
         const QskLevelingSensor* sensor, quint8 nodeRole, QSGNode* node ) const;
 };
+
+#endif
\ No newline at end of file
diff --git a/src/controls/private/QskLevelingSensorNodes.h b/src/controls/private/QskLevelingSensorNodes.h
index 23f3dbd1..6fd02425 100644
--- a/src/controls/private/QskLevelingSensorNodes.h
+++ b/src/controls/private/QskLevelingSensorNodes.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef QSK_LEVELING_SENSOR_NODES_H
+#define QSK_LEVELING_SENSOR_NODES_H
 
 #include "QskLevelingSensorUtility.h"
 
@@ -316,3 +317,5 @@ struct RadialTickmarksLabelsNode final : public TickmarksLabelsNode< RadialTickm
         } * s + o;
     }
 };
+
+#endif
\ No newline at end of file
diff --git a/src/controls/private/QskLevelingSensorUtility.h b/src/controls/private/QskLevelingSensorUtility.h
index 404092b5..e51e89cd 100644
--- a/src/controls/private/QskLevelingSensorUtility.h
+++ b/src/controls/private/QskLevelingSensorUtility.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef QSK_LEVELING_SENSOR_UTILITY_H
+#define QSK_LEVELING_SENSOR_UTILITY_H
 
 #include <qmath.h>
 #include <qmatrix4x4.h>
@@ -71,4 +72,6 @@ inline QskScaleTickmarks filtered( const QskScaleTickmarks& tickmarks,
     result.setMediumTicks( ticks[ QskScaleTickmarks::MediumTick ] );
     result.setMajorTicks( ticks[ QskScaleTickmarks::MajorTick ] );
     return result;
-}
\ No newline at end of file
+}
+
+#endif
\ No newline at end of file
diff --git a/src/controls/private/QskSGNodeUtility.h b/src/controls/private/QskSGNodeUtility.h
index 12ba5683..42bdf208 100644
--- a/src/controls/private/QskSGNodeUtility.h
+++ b/src/controls/private/QskSGNodeUtility.h
@@ -1,4 +1,5 @@
-#pragma once
+#ifndef QSK_SGNODE_UTILITY_H
+#define QSK_SGNODE_UTILITY_H
 
 #include <QSGNode>
 
@@ -35,4 +36,6 @@ namespace QskSGNode
 
         return static_cast< Root* >( root );
     }
-}
\ No newline at end of file
+}
+
+#endif
\ No newline at end of file