diff --git a/.changeset/perfect-countries-sleep.md b/.changeset/perfect-countries-sleep.md
new file mode 100644
index 00000000..8708cfa0
--- /dev/null
+++ b/.changeset/perfect-countries-sleep.md
@@ -0,0 +1,5 @@
+---
+"yak-swc": patch
+---
+
+Improve cross-os hashes to be more consistent.
diff --git a/.github/workflows/autofix.yml b/.github/workflows/autofix.yml
index a5d551b7..f28c8fd9 100644
--- a/.github/workflows/autofix.yml
+++ b/.github/workflows/autofix.yml
@@ -18,6 +18,17 @@ jobs:
         with:
           node-version: 20
 
+      - name: Install Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          profile: minimal
+          override: true
+      - name: Enable caching
+        uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: packages/yak-swc
+
       - uses: pnpm/action-setup@v4
         name: Install pnpm
         with:
diff --git a/packages/yak-swc/package.json b/packages/yak-swc/package.json
index 7bc494fe..fbbb6b9e 100644
--- a/packages/yak-swc/package.json
+++ b/packages/yak-swc/package.json
@@ -22,6 +22,7 @@
   "scripts": {
     "build": "cargo build --release --target=wasm32-wasi",
     "prepublishOnly": "npm run build",
+    "prettier": "cargo fmt --all",
     "test": "cargo test",
     "test:snapshots": "cd yak_swc && UPDATE=1 cargo test"
   },
diff --git a/packages/yak-swc/relative_posix_path/src/lib.rs b/packages/yak-swc/relative_posix_path/src/lib.rs
index f5f4f198..c7b1c7f8 100644
--- a/packages/yak-swc/relative_posix_path/src/lib.rs
+++ b/packages/yak-swc/relative_posix_path/src/lib.rs
@@ -30,7 +30,7 @@ pub fn relative_posix_path(base_path: &str, filename: &str) -> String {
 /// - "/foo/bar" -> "/foo/bar"
 fn convert_path_to_posix(path: &str) -> String {
   lazy_static! {
-    static ref PATH_REPLACEMENT_REGEX: Regex = Regex::new(r":\\|\\").unwrap();
+    static ref PATH_REPLACEMENT_REGEX: Regex = Regex::new(r":\\|\\|:/").unwrap();
   }
 
   PATH_REPLACEMENT_REGEX.replace_all(path, "/").to_string()
@@ -56,6 +56,14 @@ mod tests {
     );
   }
 
+  #[test]
+  fn test_relative_path_windows_forward_slash() {
+    assert_eq!(
+      relative_posix_path(r"E:\foo", "E:/foo/bar/file.tsx"),
+      "bar/file.tsx"
+    );
+  }
+
   #[test]
   fn test_convert_unix_path() {
     assert_eq!(convert_path_to_posix(r"/foo/bar"), "/foo/bar");