diff --git a/Cargo.lock b/Cargo.lock
index fb66e5eaa..5aaf59dcc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1090,6 +1090,7 @@ dependencies = [
  "native-tls",
  "normpath",
  "once_cell",
+ "path-slash",
  "pep440_rs",
  "pep508_rs",
  "platform-info",
diff --git a/Cargo.toml b/Cargo.toml
index 6bac735fc..280efb7bc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -71,6 +71,7 @@ lddtree = "0.3.3"
 cc = "1.0.72"
 dunce = "1.0.2"
 normpath = "1.0.0"
+path-slash = "0.2.1"
 pep440_rs = { version = "0.3.6", features = ["serde"] }
 pep508_rs = { version = "0.2.1", features = ["serde"] }
 time = "0.3.17"
diff --git a/src/source_distribution.rs b/src/source_distribution.rs
index 230d13948..fe7022329 100644
--- a/src/source_distribution.rs
+++ b/src/source_distribution.rs
@@ -6,6 +6,7 @@ use cargo_metadata::{Metadata, MetadataCommand};
 use fs_err as fs;
 use ignore::overrides::Override;
 use normpath::PathExt as _;
+use path_slash::PathExt as _;
 use std::collections::HashMap;
 use std::path::{Path, PathBuf};
 use std::process::Command;
@@ -458,7 +459,7 @@ fn add_cargo_package_files_to_sdist(
             let main_member_name = abs_manifest_dir
                 .strip_prefix(workspace_root)
                 .unwrap()
-                .to_str()
+                .to_slash()
                 .unwrap()
                 .to_string();
             deps_to_keep.insert(