diff --git a/daemon/src/rtorrent.rc b/daemon/src/rtorrent.rc
index 42818a41a8daa56c4e42d70a5264a9a057b11e96..4aaa3701cfe73eed63716c56a92030ea99552ac2 100644
--- a/daemon/src/rtorrent.rc
+++ b/daemon/src/rtorrent.rc
@@ -8,7 +8,7 @@ method.insert = cfg.session,  private|const|string, /session/
 method.insert = cfg.logfile,  private|const|string, (cat,(cfg.tmp),"rtorrent.log")
 
 # Listening port for incoming peer traffic
-network.port_range.set = (system.env,RT_MIN_PORT)-(system.env,RT_MAX_PORT)
+network.port_range.set = (cat,(system.env,RT_MIN_PORT),"-",(system.env,RT_MAX_PORT))
 network.port_random.set = no
 
 # Distributed Hash Table and Peer EXchange