diff --git a/src/paxcounter.conf b/src/paxcounter.conf
index 4c0a6061..4c89cf72 100644
--- a/src/paxcounter.conf
+++ b/src/paxcounter.conf
@@ -98,7 +98,6 @@
 #define BMEPORT                         7       // BME680 sensor
 #define BATTPORT                        8       // battery voltage
 #define TIMEPORT                        9       // time query and response
-#define TIMEDIFFPORT                    13      // time adjust diff
 #define SENSOR1PORT                     10      // user sensor #1
 #define SENSOR2PORT                     11      // user sensor #2
 #define SENSOR3PORT                     12      // user sensor #3