diff --git a/_demo_procMan.py b/_demo_procMan.py
index d407ad1..10191ba 100644
--- a/_demo_procMan.py
+++ b/_demo_procMan.py
@@ -23,7 +23,7 @@ sdrProc.start(True)
 mmProc = ProcessManager("/opt/multimon/multimon-ng", textMode=True)
 # mmProc.addArgument("-i")
 # mmProc.addArgument("-a POCSAG1200 -a FMSFSK -a ZVEI1")
-mmProc.addArgument("-f aplha")
+mmProc.addArgument("-f alpha")
 mmProc.addArgument("-t raw /dev/stdin -")
 mmProc.setStdin(sdrProc.stdout)
 mmProc.start(True)