diff --git a/net-analyzer/fprobe/files/conf.d-fprobe b/net-analyzer/fprobe/files/conf.d-fprobe
index f73ccf4c58..a93c5c10b2 100644
--- a/net-analyzer/fprobe/files/conf.d-fprobe
+++ b/net-analyzer/fprobe/files/conf.d-fprobe
@@ -23,7 +23,7 @@ IFACE=eth0
 #LOCALIP=
 
 # SNMP iface id
-SNMP_IFACE="${IFACE//eth}"
+SNMP_IFACE="${IFACE#eth}"
 
 # Maximum number of concurrent flows to track
 # using a specified amount of memory
diff --git a/net-analyzer/fprobe/files/init.d-fprobe b/net-analyzer/fprobe/files/init.d-fprobe
index efa5357177..c470af432c 100644
--- a/net-analyzer/fprobe/files/init.d-fprobe
+++ b/net-analyzer/fprobe/files/init.d-fprobe
@@ -1,5 +1,5 @@
 #!/sbin/openrc-run
-# Copyright 1999-2008 Gentoo Foundation
+# Copyright 1999-2017 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 depend() {
@@ -14,14 +14,14 @@ PIDFILE="/var/run/fprobe$PIDFILE_EXTRA.pid"
 start() {
 	ebegin "Starting fprobe"
 	local OPTS=""
-	[ "${PROMISC}" == "yes" ] || OPTS="${OPTS} -p"
+	[ "${PROMISC}" = "yes" ] || OPTS="${OPTS} -p"
 	[ -n "${FILTER}" ] && OPTS="${OPTS} -f '${FILTER}'"
 	for optname in i:IFACE s:TIMER_EXPIRED g:TIME_FRAGMENTED d:TIMER_IDLE \
 		e:TIMER_ACTIVE n:FLOW_VER a:LOCALIP x:SNMP_IFACE b:MEMBULK \
 		m:MEMLIMIT q:PENDING B:KERNBUF r:RTPRIO t:DELAY S:SNAPLEN \
 		c:CHROOT u:USER v:LOGLEVEL ; do
-	    opt="${optname/:*}"	optvar="${optname/*:}"
-	    optvalue="${!optvar}"
+	    opt="${optname%:*}"	optvar="${optname#*:}"
+	    eval optvalue='$'$optvar
 	    [ -n "$optvalue" ] && OPTS="${OPTS} -${opt} ${optvalue}"
 	done
 	OPTS="${OPTS} -l 1:${PIDFILE_ID} ${COLLECTORS}"