diff --git a/app/include/user_modules.h b/app/include/user_modules.h
index a21cee19..0f6b65f8 100644
--- a/app/include/user_modules.h
+++ b/app/include/user_modules.h
@@ -27,7 +27,7 @@
 #define LUA_USE_MODULES_OW
 #define LUA_USE_MODULES_BIT
 #define LUA_USE_MODULES_MQTT
-// #define LUA_USE_MODULES_COAP			// need about 4k more ram for now
+#define LUA_USE_MODULES_COAP			// need about 4k more ram for now
 #define LUA_USE_MODULES_U8G
 #define LUA_USE_MODULES_WS2812
 #endif /* LUA_USE_MODULES */
diff --git a/app/lua/lmathlib.c b/app/lua/lmathlib.c
index a9f553bf..c7f22502 100644
--- a/app/lua/lmathlib.c
+++ b/app/lua/lmathlib.c
@@ -336,7 +336,7 @@ const LUA_REG_TYPE math_map[] = {
   {LSTRKEY("floor"), LFUNCVAL(math_floor)},
   // {LSTRKEY("fmod"),  LFUNCVAL(math_fmod)},
 #if LUA_OPTIMIZE_MEMORY > 0 && defined(LUA_COMPAT_MOD)
-  {LSTRKEY("mod"),   LFUNCVAL(math_fmod)}, 
+  // {LSTRKEY("mod"),   LFUNCVAL(math_fmod)}, 
 #endif
   // {LSTRKEY("frexp"), LFUNCVAL(math_frexp)},
   // {LSTRKEY("ldexp"), LFUNCVAL(math_ldexp)},