diff --git a/pip/src/interpreter.rs b/pip/src/interpreter.rs
index 092bd3b139..620291ed5c 100644
--- a/pip/src/interpreter.rs
+++ b/pip/src/interpreter.rs
@@ -144,9 +144,7 @@ impl Interpreter {
             .map_py_err()?;
             SourceMap::new(
                 project.sources,
-                Some(Arc::from(
-                    manifest_descriptor.0.manifest_dir.to_string_lossy(),
-                )),
+                None,
             )
         } else {
             SourceMap::default()