diff --git a/src/scripting/game_lua_kernel.cpp b/src/scripting/game_lua_kernel.cpp
index 42b8aa9c8888..a68b2605d1f3 100644
--- a/src/scripting/game_lua_kernel.cpp
+++ b/src/scripting/game_lua_kernel.cpp
@@ -2310,9 +2310,9 @@ int game_lua_kernel::intf_put_unit(lua_State *L)
 		if (!map().on_board(loc)) {
 			return luaL_argerror(L, 1, "invalid location");
 		}
-	} else if (luaW_tolocation(L, 1, loc)) {
+	} else if (luaW_tolocation(L, 2, loc)) {
 		if (!map().on_board(loc)) {
-			return luaL_argerror(L, 1, "invalid location");
+			return luaL_argerror(L, 2, "invalid location");
 		}
 	}