diff --git a/radio/src/lua/api_general.cpp b/radio/src/lua/api_general.cpp
index 99dd8aeab..3ee1bf1ae 100644
--- a/radio/src/lua/api_general.cpp
+++ b/radio/src/lua/api_general.cpp
@@ -1742,6 +1742,7 @@ const luaR_value_entry opentxConstants[] = {
   { "VALUE", INPUT_TYPE_VALUE },
   { "SOURCE", INPUT_TYPE_SOURCE },
   { "REPLACE", MLTPX_REP },
+  { "MIXSRC_MAX", MIXSRC_MAX },
   { "MIXSRC_FIRST_INPUT", MIXSRC_FIRST_INPUT },
   { "MIXSRC_Rud", MIXSRC_Rud },
   { "MIXSRC_Ele", MIXSRC_Ele },