diff --git a/src/base/unicodestrings.h b/src/base/unicodestrings.h
index 88ffe7782..9f44b1192 100644
--- a/src/base/unicodestrings.h
+++ b/src/base/unicodestrings.h
@@ -26,6 +26,8 @@
  * exception statement from your version.
  */
 
+#pragma once
+
 // This file must be encoded in "UTF-8 with BOM"
 #ifdef _MSC_VER
 #pragma execution_character_set("utf-8")
diff --git a/src/gui/categoryfilterwidget.h b/src/gui/categoryfilterwidget.h
index 0c93a5ffb..da9af5dca 100644
--- a/src/gui/categoryfilterwidget.h
+++ b/src/gui/categoryfilterwidget.h
@@ -26,7 +26,9 @@
  * exception statement from your version.
  */
 
- #include <QTreeView>
+#pragma once
+
+#include <QTreeView>
 
 class CategoryFilterWidget : public QTreeView
 {