RustPython
diff --git a/‎crates/vm/src/stdlib/sys.rs‎
Lines changed: 2 additions & 1 deletion b/‎crates/vm/src/stdlib/sys.rs‎
Lines changed: 2 additions & 1 deletion
@@ -658,7 +658,8 @@ pub mod sys {
     fn implementation(vm: &VirtualMachine) -> PyRef<PyNamespace> {
         const NAME: &str = "rustpython";
 
-        let cache_tag = format!("{NAME}-{}_{}", version::MAJOR_IMPL, version::MINOR_IMPL);
+        // cache tag uses 'cpython' because our compiler is cpython compatible
+        let cache_tag = format!("cpython-{}{}", version::MAJOR, version::MINOR);
         let ctx = &vm.ctx;
         py_namespace!(vm, {
             "name" => ctx.new_str(NAME),