diff --git a/debian/scripts/koha-functions.sh b/debian/scripts/koha-functions.sh
index 9d0d06db64..d752d86fa3 100755
--- a/debian/scripts/koha-functions.sh
+++ b/debian/scripts/koha-functions.sh
@@ -1247,7 +1247,7 @@ _sysv_start_z3950()
         warn "Not a test system, disabling debugger"
     fi
 
-    Z3950OPTS="-c ${CONFIGDIR} \
+    Z3950OPTS="--config-dir ${CONFIGDIR} \
                -u ${instance_user} \
                -p ${PIDFILE} ${daemonize} ${logging}"
 
diff --git a/debian/systemd/koha-z3950@.service b/debian/systemd/koha-z3950@.service
index 4db1e81aaf..18a7cca3cc 100644
--- a/debian/systemd/koha-z3950@.service
+++ b/debian/systemd/koha-z3950@.service
@@ -17,7 +17,7 @@ ExecStartPre=+/usr/sbin/koha-generate-env z3950 %i
 EnvironmentFile=-/run/koha/%i/z3950.env
 ExecStart=/usr/share/koha/bin/z3950_responder.pl \
     ${Z3950_ADDITIONAL_OPTS} \
-    -c ${Z3950_CONFIGDIR} \
+    --config-dir ${Z3950_CONFIGDIR} \
     -u %i-koha \
     -p /var/run/koha/%i/z3950-responder.pid \
     -D \
diff --git a/misc/z3950_responder.pl b/misc/z3950_responder.pl
index 9058286c52..e262dd0e7b 100755
--- a/misc/z3950_responder.pl
+++ b/misc/z3950_responder.pl
@@ -29,7 +29,7 @@ use Koha::Z3950Responder;
 =head1 SYNOPSIS
 
    z3950_responder.pl [-h|--help] [--man] [-a <pdufile>] [-v <loglevel>] [-l <logfile>] [-u <user>]
-                      [-c <config>] [-t <minutes>] [-k <kilobytes>] [-d <daemon>] [-p <pidfile>]
+                      [--config-dir <config>] [-t <minutes>] [-k <kilobytes>] [-d <daemon>] [-p <pidfile>]
                       [-C certfile] [-zKiDST1] [-m <time-format>] [-w <directory>] [--debug]
                       [--add-item-status=SUBFIELD] [--prefetch=NUM_RECORDS] [--config-dir=<directory>]
                       [<listener-addr>... ]