diff --git a/lib/og.js b/lib/og.js
index 9631975..8c96434 100644
--- a/lib/og.js
+++ b/lib/og.js
@@ -485,10 +485,10 @@ export async function generateOgImages(contentDir, cacheDir, siteName, batchSize
     // Render SVG to PNG using the system resvg CLI
     // Requires: pkg install resvg
     const outPath = join(ogDir, `${slug}.png`);
-    const resvgProc = spawnSync(
-      "resvg",
-      ["-w", String(WIDTH), "-b", COLORS.bg, "-o", outPath, "-"],
-      { input: svg, encoding: "buffer" }
+      const resvgProc = spawnSync(
+        "resvg",
+        ["-w", String(WIDTH), "-b", COLORS.bg, "-o", outPath, "-"],
+        { input: svg, encoding: null }
     );
     if (resvgProc.error) {
       throw resvgProc.error;