diff --git a/xfce-base/xfconf/xfconf-4.13.4.ebuild b/xfce-base/xfconf/xfconf-4.13.4.ebuild
index eff57ca455093..d82d16a974dd1 100644
--- a/xfce-base/xfconf/xfconf-4.13.4.ebuild
+++ b/xfce-base/xfconf/xfconf-4.13.4.ebuild
@@ -52,7 +52,8 @@ my_test() {
 	eval "${out}"
 
 	local ret=0
-	nonfatal emake check || ret=1
+	# https://bugzilla.xfce.org/show_bug.cgi?id=13840
+	nonfatal emake -j1 check || ret=1
 
 	kill "${XFCONFD_PID}" || ewarn "Unable to kill xfconfd"
 	return "${ret}"