diff --git a/quartz/plugins/transformers/lastmod.ts b/quartz/plugins/transformers/lastmod.ts
index c561ff488..02278037d 100644
--- a/quartz/plugins/transformers/lastmod.ts
+++ b/quartz/plugins/transformers/lastmod.ts
@@ -58,8 +58,7 @@ export const CreatedModifiedDate: QuartzTransformerPlugin<Partial<Options>> = (u
                   // or 1+ level higher in case of a submodule/subtree setup
                   repo = Repository.discover(fullFp)
                 }
-
-                var relativePath = fullFp.replace(repo.workdir()!, "")
+                const relativePath = path.relative(repo.workdir()!, fullFp)
 
                 try {
                   modified ||= await repo.getFileLatestModifiedDateAsync(relativePath)