diff --git a/vm/src/stdlib/errno.rs b/vm/src/stdlib/errno.rs
index 2e4b456b14..221a868572 100644
--- a/vm/src/stdlib/errno.rs
+++ b/vm/src/stdlib/errno.rs
@@ -1,9 +1,13 @@
 use crate::VirtualMachine;
 use crate::{ItemProtocol, PyObjectRef};
 
+#[pymodule]
+mod errno {}
+
 pub fn make_module(vm: &VirtualMachine) -> PyObjectRef {
+    let module = errno::make_module(vm);
     let errorcode = vm.ctx.new_dict();
-    let module = py_module!(vm, "errno", {
+    extend_module!(vm, module, {
         "errorcode" => errorcode.clone(),
     });
     for (name, code) in ERROR_CODES {
diff --git a/vm/src/stdlib/sysconfigdata.rs b/vm/src/stdlib/sysconfigdata.rs
index 72f7f9bb39..2a2d4e8f4b 100644
--- a/vm/src/stdlib/sysconfigdata.rs
+++ b/vm/src/stdlib/sysconfigdata.rs
@@ -1,23 +1,28 @@
-use super::sys::MULTIARCH;
-use crate::{function::IntoPyObject, ItemProtocol, PyObjectRef, VirtualMachine};
+pub(crate) use _sysconfigdata::make_module;
 
-pub fn make_module(vm: &VirtualMachine) -> PyObjectRef {
-    let vars = vm.ctx.new_dict();
-    macro_rules! sysvars {
-        ($($key:literal => $value:expr),*$(,)?) => {{
-            $(vars.set_item($key, $value.into_pyobject(vm), vm).unwrap();)*
-        }};
-    }
-    sysvars! {
-        // fake shared module extension
-        "EXT_SUFFIX" => format!(".rustpython-{}", MULTIARCH),
-        "MULTIARCH" => MULTIARCH,
-        // enough for tests to stop expecting urandom() to fail after restricting file resources
-        "HAVE_GETRANDOM" => 1,
-    }
-    include!(concat!(env!("OUT_DIR"), "/env_vars.rs"));
+#[pymodule]
+pub(crate) mod _sysconfigdata {
+    use crate::{
+        builtins::PyDictRef, function::IntoPyObject, stdlib::sys::MULTIARCH, ItemProtocol,
+        VirtualMachine,
+    };
 
-    py_module!(vm, "_sysconfigdata", {
-        "build_time_vars" => vars,
-    })
+    #[pyattr]
+    fn build_time_vars(vm: &VirtualMachine) -> PyDictRef {
+        let vars = vm.ctx.new_dict();
+        macro_rules! sysvars {
+            ($($key:literal => $value:expr),*$(,)?) => {{
+                $(vars.set_item($key, $value.into_pyobject(vm), vm).unwrap();)*
+            }};
+        }
+        sysvars! {
+            // fake shared module extension
+            "EXT_SUFFIX" => format!(".rustpython-{}", MULTIARCH),
+            "MULTIARCH" => MULTIARCH,
+            // enough for tests to stop expecting urandom() to fail after restricting file resources
+            "HAVE_GETRANDOM" => 1,
+        }
+        include!(concat!(env!("OUT_DIR"), "/env_vars.rs"));
+        vars
+    }
 }