diff --git a/packages/opencode/src/util/hash.ts b/packages/opencode/src/util/hash.ts
index 648148f93..680e0f40b 100644
--- a/packages/opencode/src/util/hash.ts
+++ b/packages/opencode/src/util/hash.ts
@@ -2,6 +2,6 @@ import { createHash } from "crypto"
 
 export namespace Hash {
   export function fast(input: string | Buffer): string {
-    return createHash("xxhash3-xxh64").update(input).digest("hex")
+    return createHash("sha1").update(input).digest("hex")
   }
 }