diff --git a/include/drawinglayer/animation/animationtiming.hxx b/include/drawinglayer/animation/animationtiming.hxx
index c92639b99ca8..44ad0ef6aa7f 100644
--- a/include/drawinglayer/animation/animationtiming.hxx
+++ b/include/drawinglayer/animation/animationtiming.hxx
@@ -17,8 +17,7 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
-#ifndef INCLUDED_DRAWINGLAYER_ANIMATION_ANIMATIONTIMING_HXX
-#define INCLUDED_DRAWINGLAYER_ANIMATION_ANIMATIONTIMING_HXX
+#pragma once
 
 #include <drawinglayer/drawinglayerdllapi.h>
 
@@ -126,7 +125,4 @@ namespace drawinglayer::animation
 
 } // end of namespace drawinglayer::animation
 
-
-#endif //INCLUDED_DRAWINGLAYER_ANIMATION_ANIMATIONTIMING_HXX
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/drawinglayer/attribute/materialattribute3d.hxx b/include/drawinglayer/attribute/materialattribute3d.hxx
index 07c11e3026fb..24fbd1e49c94 100644
--- a/include/drawinglayer/attribute/materialattribute3d.hxx
+++ b/include/drawinglayer/attribute/materialattribute3d.hxx
@@ -17,8 +17,7 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
-#ifndef INCLUDED_DRAWINGLAYER_ATTRIBUTE_MATERIALATTRIBUTE3D_HXX
-#define INCLUDED_DRAWINGLAYER_ATTRIBUTE_MATERIALATTRIBUTE3D_HXX
+#pragma once
 
 #include <drawinglayer/drawinglayerdllapi.h>
 #include <o3tl/cow_wrapper.hxx>
@@ -72,7 +71,4 @@ namespace drawinglayer::attribute
 
 } // end of namespace drawinglayer::attribute
 
-
-#endif //INCLUDED_DRAWINGLAYER_ATTRIBUTE_MATERIALATTRIBUTE3D_HXX
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */