diff --git a/rtengine/settings.h b/rtengine/settings.h
index 8852c05c8..a32a1b7dd 100644
--- a/rtengine/settings.h
+++ b/rtengine/settings.h
@@ -16,9 +16,9 @@
  *  You should have received a copy of the GNU General Public License
  *  along with RawTherapee.  If not, see <https://www.gnu.org/licenses/>.
  */
-#ifndef _RTSETTINGS_
-#define _RTSETTINGS_
+#pragma once
 
+#include <glibmm/ustring.h>
 namespace rtengine
 {
 
@@ -97,6 +97,3 @@ public:
     static void      destroy(Settings* s);
 };
 }
-
-#endif
-
diff --git a/rtgui/options.h b/rtgui/options.h
index b2263f59c..33d6b6f90 100644
--- a/rtgui/options.h
+++ b/rtgui/options.h
@@ -19,6 +19,7 @@
 #pragma once
 
 #include <set>
+#include <vector>
 #include <gtkmm/enums.h>
 #include "../rtengine/settings.h"
 #include <exception>