diff --git a/app-admin/keepass/keepass-2.40-r1.ebuild b/app-admin/keepass/keepass-2.40-r1.ebuild
index 2e9012f82203c..ef34df76c0bf7 100644
--- a/app-admin/keepass/keepass-2.40-r1.ebuild
+++ b/app-admin/keepass/keepass-2.40-r1.ebuild
@@ -41,6 +41,8 @@ src_prepare() {
 }
 
 src_compile() {
+	export MONO_REGISTRY_PATH=/dev/null # bug 659808
+
 	# Build with Release target
 	xbuild /target:KeePass /property:Configuration=Release || die