diff --git a/src/index.ts b/src/index.ts
index 209d517..1d9fdb8 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -166,7 +166,7 @@ export default function ofm() {
                 const alias = rawAlias?.slice(1).trim();
 
                 // internal link
-                const url = fp + anchor;
+                const url = encodeURIComponent(fp) + anchor;
                 return {
                     type: "link",
                     url,