diff --git a/src/modules/Image/encodings/psd_constant_strings.h b/src/modules/Image/encodings/psd_constant_strings.h
index 744e95a632cc4e007918ce8f115f9ade6d0ad131..75a8959b2a56af884a2b6d4390573e99ec6c0703 100644
--- a/src/modules/Image/encodings/psd_constant_strings.h
+++ b/src/modules/Image/encodings/psd_constant_strings.h
@@ -7,6 +7,11 @@ STRING(top);
 STRING(left);
 STRING(right);
 STRING(bottom);
+STRING(mask_top);
+STRING(mask_left);
+STRING(mask_right);
+STRING(mask_bottom);
+STRING(mask_flags);
 STRING(opacity);
 STRING(clipping);
 STRING(flags);