Index: libexec/rc/rc.subr
===================================================================
--- libexec/rc/rc.subr
+++ libexec/rc/rc.subr
@@ -948,7 +948,7 @@
 	_keywords="start stop restart rcvar enable disable delete enabled describe extracommands $extra_commands"
 	rc_pid=
 	_pidcmd=
-	_procname=${procname:-${command}}
+	_procname=${procname:=${command}}
 
 					# setup pid check command
 	if [ -n "$_procname" ]; then