diff --git a/vm/src/builtins/code.rs b/vm/src/builtins/code.rs
index 19d586bd0dc..2258af473ff 100644
--- a/vm/src/builtins/code.rs
+++ b/vm/src/builtins/code.rs
@@ -230,6 +230,11 @@ impl PyRef<PyCode> {
         vm.ctx.new_tuple(cellvars)
     }
 
+    #[pygetset]
+    fn co_nlocals(self) -> usize {
+        self.varnames.len()
+    }
+
     #[pygetset]
     fn co_firstlineno(self) -> usize {
         self.code.first_line_number