diff --git a/rtengine/procparams.cc b/rtengine/procparams.cc
index 7662a9920..9ffa0a290 100644
--- a/rtengine/procparams.cc
+++ b/rtengine/procparams.cc
@@ -16,16 +16,22 @@
* You should have received a copy of the GNU General Public License
* along with RawTherapee. If not, see .
*/
+#include