diff --git a/games-puzzle/ksokoban/ksokoban-0.5.0_pre20210905.ebuild b/games-puzzle/ksokoban/ksokoban-0.5.0_pre20210905.ebuild
index c4e8cfe2c4924..1035f3d3a619a 100644
--- a/games-puzzle/ksokoban/ksokoban-0.5.0_pre20210905.ebuild
+++ b/games-puzzle/ksokoban/ksokoban-0.5.0_pre20210905.ebuild
@@ -3,7 +3,7 @@
 
 EAPI=8
 
-ECM_HANDBOOK="optional"
+ECM_HANDBOOK="forceoptional"
 KDE_ORG_COMMIT=39b9d1c1702a21a6e0fae82876c29c1f6bb77fae
 KFMIN=5.82.0
 QTMIN=5.15.2