diff --git a/lib/compile.js b/lib/compile.js
index c522e78..938e83e 100644
--- a/lib/compile.js
+++ b/lib/compile.js
@@ -58,7 +58,9 @@ const compile = async function(inputContent, inputPath, sassOptions, config, pos
   // become self-referential. This means that `dependantsOf()` for an updated file
   // returns not only files that depend on it but also the updated file itself.
   let dependant = path.normalize(inputPath);
-  let loadedPaths = loadedUrls.map(loadedUrl => path.relative(workingDir, url.fileURLToPath(loadedUrl, {windows: false })));
+  let loadedPaths = loadedUrls.map(loadedUrl => {
+    return path.relative(workingDir, upath.normalize(url.fileURLToPath(loadedUrl)));
+  });
   depMap.update(dependant, loadedPaths);
 
   return css;