diff --git a/meta-openembedded/meta-networking/recipes-netkit/netkit-rusers/netkit-rusers_0.17.bb b/meta-openembedded/meta-networking/recipes-netkit/netkit-rusers/netkit-rusers_0.17.bb
index c39faef..eee96d8 100644
--- a/meta-openembedded/meta-networking/recipes-netkit/netkit-rusers/netkit-rusers_0.17.bb
+++ b/meta-openembedded/meta-networking/recipes-netkit/netkit-rusers/netkit-rusers_0.17.bb
@@ -69,4 +69,4 @@
 
 # http://errors.yoctoproject.org/Errors/Details/186962/
 COMPATIBLE_HOST_libc-musl = 'null'
-PNBLACKLIST[netkit-rusers] = "Fails to build rup.c:51:10: fatal error: rstat.h: No such file or directory"
+PNBLACKLIST[netkit-rusers] ?= "Fails to build rup.c:51:10: fatal error: rstat.h: No such file or directory"