diff --git a/src/module_writer.rs b/src/module_writer.rs
index fe628f3e7..ba41d0fc7 100644
--- a/src/module_writer.rs
+++ b/src/module_writer.rs
@@ -964,7 +964,7 @@ pub fn write_uniffi_module(
     let module;
     if let Some(python_module) = &project_layout.python_module {
         if editable {
-            let base_path = python_module.join(module_name);
+            let base_path = python_module.join(&project_layout.extension_name);
             fs::create_dir_all(&base_path)?;
             let target = base_path.join(&cdylib);
             fs::copy(artifact, &target).context(format!(