diff --git a/games-puzzle/lightsoff/lightsoff-40.0.1.ebuild b/games-puzzle/lightsoff/lightsoff-40.0.1.ebuild
index 47b3e2b99329f..211499a9c37f0 100644
--- a/games-puzzle/lightsoff/lightsoff-40.0.1.ebuild
+++ b/games-puzzle/lightsoff/lightsoff-40.0.1.ebuild
@@ -33,6 +33,13 @@ BDEPEND="
 src_prepare() {
 	xdg_src_prepare
 	vala_src_prepare
+
+	# Bug #778845
+	sed -i \
+		-e 's:40\.rc:40~rc:' \
+		-e 's:40\.beta:40~beta:' \
+		-e 's:40\.alpha:40~alpha:' \
+		data/org.gnome.LightsOff.appdata.xml.in || die
 }
 
 pkg_postinst() {