diff --git a/quartz/plugins/transformers/frontmatter.ts b/quartz/plugins/transformers/frontmatter.ts
index 625cf607a..9679bd1ec 100644
--- a/quartz/plugins/transformers/frontmatter.ts
+++ b/quartz/plugins/transformers/frontmatter.ts
@@ -67,7 +67,8 @@ export const FrontMatter: QuartzTransformerPlugin<Partial<Options>> = (userOpts)
         [remarkFrontmatter, ["yaml", "toml"]],
         () => {
           return (_, file) => {
-            const { data } = matter(Buffer.from(file.value), {
+            const fileData = Buffer.from(file.value as Uint8Array)
+            const { data } = matter(fileData, {
               ...opts,
               engines: {
                 yaml: (s) => yaml.load(s, { schema: yaml.JSON_SCHEMA }) as object,
diff --git a/quartz/processors/parse.ts b/quartz/processors/parse.ts
index 479313f49..15e559dc7 100644
--- a/quartz/processors/parse.ts
+++ b/quartz/processors/parse.ts
@@ -95,7 +95,7 @@ export function createFileParser(ctx: BuildCtx, fps: FilePath[]) {
 
         // Text -> Text transforms
         for (const plugin of cfg.plugins.transformers.filter((p) => p.textTransform)) {
-          file.value = plugin.textTransform!(ctx, file.value.toString())
+          file.value = plugin.textTransform!(ctx, Buffer.from(file.value as Uint8Array))
         }
 
         // base data properties that plugins may use