diff --git a/src/modules/atproto/shortDid.ts b/src/modules/atproto/shortDid.ts
index 96acf2b..6df3955 100644
--- a/src/modules/atproto/shortDid.ts
+++ b/src/modules/atproto/shortDid.ts
@@ -1,6 +1,8 @@
 export const toShortDid = (did: string) => did.replace(/^did:(plc:)?/, "")
 // did:plc:xxx → xxx, did:web:x → web:x
 
-export const fromShortDid = (shortDid: string) =>
-  shortDid.includes(":") ? `did:${shortDid}` : `did:plc:${shortDid}`
-// xxx → did:plc:xxx, web:x → did:web:x
+export const fromShortDid = (shortDid: string) => {
+  if (shortDid.startsWith("did:")) return shortDid
+  return shortDid.includes(":") ? `did:${shortDid}` : `did:plc:${shortDid}`
+}
+// xxx → did:plc:xxx, web:x → did:web:x, did:plc:xxx → did:plc:xxx (passthrough)