diff --git a/waku/utils/requests.nim b/waku/utils/requests.nim
index 5e5b9d960..d9afd2887 100644
--- a/waku/utils/requests.nim
+++ b/waku/utils/requests.nim
@@ -7,4 +7,4 @@ import bearssl/rand, stew/byteutils
 proc generateRequestId*(rng: ref HmacDrbgContext): string =
   var bytes: array[10, byte]
   hmacDrbgGenerate(rng[], bytes)
-  return toHex(bytes)
+  return byteutils.toHex(bytes)
diff --git a/waku/waku_filter_v2/client.nim b/waku/waku_filter_v2/client.nim
index 1dc018150..954a71f56 100644
--- a/waku/waku_filter_v2/client.nim
+++ b/waku/waku_filter_v2/client.nim
@@ -30,7 +30,7 @@ type WakuFilterClient* = ref object of LPProtocol
 func generateRequestId(rng: ref HmacDrbgContext): string =
   var bytes: array[10, byte]
   hmacDrbgGenerate(rng[], bytes)
-  return toHex(bytes)
+  return byteutils.toHex(bytes)
 
 proc addSubscrObserver*(wfc: WakuFilterClient, obs: SubscriptionObserver) =
   wfc.subscrObservers.add(obs)