diff --git a/cubesatsim/cubesatsim.h b/cubesatsim/cubesatsim.h
index 9c5cae80..d5e6ee9c 100644
--- a/cubesatsim/cubesatsim.h
+++ b/cubesatsim/cubesatsim.h
@@ -128,6 +128,7 @@
 #define PROMPT_TEMP 11
 #define PROMPT_FORMAT 12
 #define PROMPT_REBOOT 13
+#define PROMPT_I2CSCAN 14
 
 #define PAYLOAD_QUERY 1
 #define PAYLOAD_RESET 2