diff --git a/owrx/dsp.py b/owrx/dsp.py
index f5e9395b..5b5aa5e0 100644
--- a/owrx/dsp.py
+++ b/owrx/dsp.py
@@ -606,6 +606,9 @@ class DspManager(SdrSourceEventClient, ClientDemodulatorSecondaryDspEventClient)
         elif mod == "rtty450":
             from csdr.chain.digimodes import RttyDemodulator
             return RttyDemodulator(50, 450, invert=True)
+        elif mod == "rtty85":
+            from csdr.chain.digimodes import RttyDemodulator
+            return RttyDemodulator(50, 85, invert=True)
 
     def setSecondaryDemodulator(self, mod):
         demodulator = self._getSecondaryDemodulator(mod)
diff --git a/owrx/modes.py b/owrx/modes.py
index 131292b6..1cd3aac5 100644
--- a/owrx/modes.py
+++ b/owrx/modes.py
@@ -121,6 +121,7 @@ class Modes(object):
         DigitalMode("bpsk63", "BPSK63", underlying=["usb"]),
         DigitalMode("rtty170", "RTTY 45/170", underlying=["usb", "lsb"]),
         DigitalMode("rtty450", "RTTY 50N/450", underlying=["lsb", "usb"]),
+        DigitalMode("rtty85", "RTTY 50N/85", underlying=["lsb", "usb"]),
         WsjtMode("ft8", "FT8"),
         WsjtMode("ft4", "FT4"),
         WsjtMode("jt65", "JT65"),