diff --git a/include/pocketpy/config.h b/include/pocketpy/config.h
index 2da9bfd7..c126bcad 100644
--- a/include/pocketpy/config.h
+++ b/include/pocketpy/config.h
@@ -53,7 +53,7 @@
 #define PK_VM_STACK_SIZE            16384
 
 // This is the maximum number of local variables in a function
-// (not recommended to change this / it should be less than 200)
+// (not recommended to change this)
 #define PK_MAX_CO_VARNAMES          64
 
 // Hash table load factor (smaller ones mean less collision but more memory)
diff --git a/src/io.cpp b/src/io.cpp
index a5e749e4..4d2bd9c7 100644
--- a/src/io.cpp
+++ b/src/io.cpp
@@ -178,7 +178,7 @@ void add_module_os(VM* vm){
         }
         List ret;
         for(auto& p: di) ret.push_back(VAR(p.path().filename().string()));
-        return VAR(ret);
+        return VAR(std::move(ret));
     });
 
     vm->bind_func(mod, "remove", 1, [](VM* vm, ArgsView args){