diff --git a/quartz/plugins/transformers/lastmod.ts b/quartz/plugins/transformers/lastmod.ts
index fd5769263..c561ff488 100644
--- a/quartz/plugins/transformers/lastmod.ts
+++ b/quartz/plugins/transformers/lastmod.ts
@@ -56,11 +56,13 @@ export const CreatedModifiedDate: QuartzTransformerPlugin<Partial<Options>> = (u
                   // Get a reference to the main git repo.
                   // It's either the same as the workdir,
                   // or 1+ level higher in case of a submodule/subtree setup
-                  repo = Repository.discover(file.cwd)
+                  repo = Repository.discover(fullFp)
                 }
 
+                var relativePath = fullFp.replace(repo.workdir()!, "")
+
                 try {
-                  modified ||= await repo.getFileLatestModifiedDateAsync(file.data.filePath!)
+                  modified ||= await repo.getFileLatestModifiedDateAsync(relativePath)
                 } catch {
                   console.log(
                     chalk.yellow(