diff --git a/formula/inc/core_resource.hxx b/formula/inc/core_resource.hxx
index 1990a36c14e3..8a8f49b77b0f 100644
--- a/formula/inc/core_resource.hxx
+++ b/formula/inc/core_resource.hxx
@@ -17,14 +17,11 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
-#ifndef INCLUDED_FORMULA_SOURCE_CORE_INC_CORE_RESOURCE_HXX
-#define INCLUDED_FORMULA_SOURCE_CORE_INC_CORE_RESOURCE_HXX
+#pragma once
 
 #include <rtl/ustring.hxx>
 #include <formula/formuladllapi.h>
 
 FORMULA_DLLPUBLIC OUString ForResId(const char *pId);
 
-#endif // INCLUDED_FORMULA_SOURCE_CORE_INC_CORE_RESOURCE_HXX
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */