diff --git a/doc/lua_api.md b/doc/lua_api.md
index c596da2ab..c22b7a3c0 100644
--- a/doc/lua_api.md
+++ b/doc/lua_api.md
@@ -7657,7 +7657,7 @@ child will follow movement and rotation of that bone.
 * `override_day_night_ratio(ratio or nil)`
     * `0`...`1`: Overrides day-night ratio, controlling sunlight to a specific
       amount.
-    * `nil`: Disables override, defaulting to sunlight based on day-night cycle
+    * Passing no arguments disables override, defaulting to sunlight based on day-night cycle
 * `get_day_night_ratio()`: returns the ratio or nil if it isn't overridden
 * `set_local_animation(idle, walk, dig, walk_while_dig, frame_speed)`:
   set animation for player model in third person view.
diff --git a/src/script/lua_api/l_object.cpp b/src/script/lua_api/l_object.cpp
index 01b1ddeaa..6b31d2541 100644
--- a/src/script/lua_api/l_object.cpp
+++ b/src/script/lua_api/l_object.cpp
@@ -2207,7 +2207,7 @@ int ObjectRef::l_override_day_night_ratio(lua_State *L)
 	bool do_override = false;
 	float ratio = 0.0f;
 
-	if (!lua_isnil(L, 2)) {
+	if (!lua_isnoneornil(L, 2)) {
 		do_override = true;
 		ratio = readParam<float>(L, 2);
 		luaL_argcheck(L, ratio >= 0.0f && ratio <= 1.0f, 1,