diff --git a/server/util/LiteHashDRBG.ts b/server/util/LiteHashDRBG.ts
index d5b4f82..e178059 100644
--- a/server/util/LiteHashDRBG.ts
+++ b/server/util/LiteHashDRBG.ts
@@ -111,11 +111,11 @@ export class LiteHashDRBG implements RNG {
     }
 
     protected async genNextBlock(): Promise<void> {
+        this.bufferIdx = 0;
         this.hq.setUint32(this.hqIdxPos, this.stateIdx, true);
+        this.stateIdx += 1;
         const digest = await sha512(this.hq.buffer);
         this.buffer = digest;
-        this.bufferIdx = 0;
-        this.stateIdx += 1;
     }
 
     public getMaxInt(): number {