diff --git a/boswatch/inputSource/sdrInput.py b/boswatch/inputSource/sdrInput.py
index 95fecd9..6dcb278 100644
--- a/boswatch/inputSource/sdrInput.py
+++ b/boswatch/inputSource/sdrInput.py
@@ -52,8 +52,8 @@ class SdrInput(InputBase):
                 mmProc.addArgument("-a POCSAG1200")
             if decoderConfig.get("poc2400", default=0):
                 mmProc.addArgument("-a POCSAG2400")
-            if lineInConfig.get("mmChar"):
-                mmProc.addArgument("-C " + str(lineInConfig.get("mmChar")))
+            if sdrConfig.get("mmChar"):
+                mmProc.addArgument("-C " + str(sdrConfig.get("mmChar")))
             mmProc.addArgument("-f alpha")
             mmProc.addArgument("-t raw -")
             mmProc.setStdin(sdrProc.stdout)