diff --git a/sonoff/xsns_29_mcp230xx.ino b/sonoff/xsns_29_mcp230xx.ino
index 3ab47559d..0e4a74e97 100644
--- a/sonoff/xsns_29_mcp230xx.ino
+++ b/sonoff/xsns_29_mcp230xx.ino
@@ -58,7 +58,7 @@ uint8_t mcp230xx_addresses[] = { MCP230xx_ADDRESS1, MCP230xx_ADDRESS2, MCP230xx_
 uint8_t mcp230xx_pincount = 0;
 uint8_t mcp230xx_int_en = 0;
 
-const char MCP230XX_SENSOR_RESPONSE[] PROGMEM = "{\"Sensor29_D%i\":{\"MODE\":%i,\"PULL-UP\":\"%s\",\"INT_MODE\":\"%s\",\"STATE\":\"%s\"}}";
+const char MCP230XX_SENSOR_RESPONSE[] PROGMEM = "{\"Sensor29_D%i\":{\"MODE\":%i,\"PULL_UP\":\"%s\",\"INT_MODE\":\"%s\",\"STATE\":\"%s\"}}";
 
 #ifdef USE_MCP230xx_OUTPUT
 const char MCP230XX_CMND_RESPONSE[] PROGMEM = "{\"S29cmnd_D%i\":{\"COMMAND\":\"%s\",\"STATE\":\"%s\"}}";