diff --git a/basegfx/source/workbench/gauss.hxx b/basegfx/source/workbench/gauss.hxx
index fc352fe7e675..3605c1cac9bd 100644
--- a/basegfx/source/workbench/gauss.hxx
+++ b/basegfx/source/workbench/gauss.hxx
@@ -39,8 +39,7 @@
     @return true, if elimination succeeded.
  */
 
-#ifndef INCLUDED_BASEGFX_SOURCE_WORKBENCH_GAUSS_HXX
-#define INCLUDED_BASEGFX_SOURCE_WORKBENCH_GAUSS_HXX
+#pragma once
 
 template <class Matrix, typename BaseType>
 bool eliminate(     Matrix&         matrix,
@@ -165,6 +164,4 @@ bool solve( Matrix&     matrix,
     return false;
 }
 
-#endif // INCLUDED_BASEGFX_SOURCE_WORKBENCH_GAUSS_HXX
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/compilerplugins/clang/plugin.hxx b/compilerplugins/clang/plugin.hxx
index 577e8998b187..156955da4b87 100644
--- a/compilerplugins/clang/plugin.hxx
+++ b/compilerplugins/clang/plugin.hxx
@@ -9,8 +9,7 @@
  *
  */
 
-#ifndef PLUGIN_H
-#define PLUGIN_H
+#pragma once
 
 #include <clang/AST/ASTContext.h>
 #include <clang/AST/RecursiveASTVisitor.h>
@@ -312,6 +311,4 @@ const Decl* getFunctionDeclContext(ASTContext& context, const Stmt* stmt);
 
 } // namespace
 
-#endif // COMPILEPLUGIN_H
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/compilerplugins/clang/pluginhandler.hxx b/compilerplugins/clang/pluginhandler.hxx
index 54ab613b3a7e..f7a399672c5d 100644
--- a/compilerplugins/clang/pluginhandler.hxx
+++ b/compilerplugins/clang/pluginhandler.hxx
@@ -9,8 +9,7 @@
  *
  */
 
-#ifndef PLUGINHANDLER_H
-#define PLUGINHANDLER_H
+#pragma once
 
 #include <cstddef>
 #include <functional>
@@ -105,6 +104,4 @@ private:
 
 }
 
-#endif // COMPILEPLUGIN_H
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/compilerplugins/clang/sharedvisitor/dummyplugin.hxx b/compilerplugins/clang/sharedvisitor/dummyplugin.hxx
index fea2786a796e..0ccc36dc86c9 100644
--- a/compilerplugins/clang/sharedvisitor/dummyplugin.hxx
+++ b/compilerplugins/clang/sharedvisitor/dummyplugin.hxx
@@ -9,8 +9,7 @@
  *
  */
 
-#ifndef DUMMYPLUGIN_H
-#define DUMMYPLUGIN_H
+#pragma once
 
 #include "config_clang.h"
 
@@ -77,6 +76,4 @@ public:
 
 } // namespace
 
-#endif // DUMMYPLUGIN_H
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */