diff --git a/waku/waku_rln_relay/group_manager/on_chain/group_manager.nim b/waku/waku_rln_relay/group_manager/on_chain/group_manager.nim
index c9df4ba01..ac608da59 100644
--- a/waku/waku_rln_relay/group_manager/on_chain/group_manager.nim
+++ b/waku/waku_rln_relay/group_manager/on_chain/group_manager.nim
@@ -375,7 +375,7 @@ method generateProof*(
   g.merkleProofCache.reverse()
   var i = 0
   while i + 31 < g.merkleProofCache.len:
-    for j in countdown(32, 1):
+    for j in countdown(31, 0):
       path_elements.add(g.merkleProofCache[i+j])
     i += 32