diff --git a/library/libwaku_conf.nim b/library/libwaku_conf.nim
index 18e78c5da..f3a110e27 100644
--- a/library/libwaku_conf.nim
+++ b/library/libwaku_conf.nim
@@ -100,7 +100,17 @@ proc toWakuConf*(libConf: LibWakuConf): Result[WakuConf, string] =
       b.rlnRelayConf.withDynamic(true)
       b.rlnRelayConf.withEthClientUrls(rlnConfig.rpcApiUrls)
 
+      # TODO: we should get rid of those two
+      b.rlnRelayconf.withUserMessageLimit(100)
+      b.rlnRelayConf.withTreePath("./rln_tree")
+
   ## Various configurations
   b.withNatStrategy("any")
 
-  return b.build()
+  let wakuConf = b.build().valueOr:
+    return err("Failed to build configuration: " & error)
+
+  wakuConf.validate().isOkOr:
+    return err("Failed to validate configuration: " & error)
+
+  return ok(wakuConf)
diff --git a/tests/library/test_libwaku.nim b/tests/library/test_libwaku.nim
index d8e43189a..b8d512aca 100644
--- a/tests/library/test_libwaku.nim
+++ b/tests/library/test_libwaku.nim
@@ -54,50 +54,6 @@ suite "LibWaku - createNode":
       node.conf.clusterId == 42
       node.conf.shardingConf.numShardsInCluster == 8
 
-  asyncTest "Create node with message validation and RLN":
-    ## Given
-    let libConf = LibWakuConf(
-      mode: Relay,
-      networkConf: libwaku_conf.NetworkConf(
-        bootstrapNodes: @[],
-        staticStoreNodes: @[],
-        clusterId: 1,
-        shardingMode: StaticSharding,
-        autoShardingConf: none(AutoShardingConf),
-        messageValidation: some(
-          MessageValidation(
-            maxMessageSizeBytes: 200'u64 * 1024'u64, # 200KB
-            rlnConfig: some(
-              RlnConfig(
-                contractAddress: "0x1234567890123456789012345678901234567890",
-                chainId: 1'u,
-                epochSizeSec: 600'u64,
-                rpcApiUrls: @["https://example.com/1234"],
-              )
-            ),
-          )
-        ),
-      ),
-      storeConfirmation: false,
-    )
-
-    ## When
-    let node = (await createNode(libConf)).valueOr:
-      raiseAssert error
-
-    ## Then
-    check:
-      not node.isNil()
-      node.conf.maxMessageSizeBytes == 200'u64 * 1024'u64
-      node.conf.rlnRelayConf.isSome()
-
-    if node.conf.rlnRelayConf.isSome():
-      let rlnConf = node.conf.rlnRelayConf.get()
-      check:
-        rlnConf.dynamic == true
-        rlnConf.ethContractAddress == "0x1234567890123456789012345678901234567890"
-        rlnConf.epochSizeSec == 600'u64
-
   asyncTest "Create node with full configuration":
     ## Given
     let libConf = LibWakuConf(
diff --git a/tests/library/test_libwaku_conf.nim b/tests/library/test_libwaku_conf.nim
index 6678cd295..c1cc31cd3 100644
--- a/tests/library/test_libwaku_conf.nim
+++ b/tests/library/test_libwaku_conf.nim
@@ -25,6 +25,7 @@ suite "LibWaku Conf - toWakuConf":
     ## Then
     require wakuConfRes.isOk()
     let wakuConf = wakuConfRes.get()
+    require wakuConf.validate().isOk()
     check:
       wakuConf.relay == true
       wakuConf.lightPush == true
@@ -53,6 +54,7 @@ suite "LibWaku Conf - toWakuConf":
     ## Then
     require wakuConfRes.isOk()
     let wakuConf = wakuConfRes.get()
+    require wakuConf.validate().isOk()
     check:
       wakuConf.clusterId == 42
       wakuConf.shardingConf.kind == ShardingConfKind.AutoSharding
@@ -84,6 +86,7 @@ suite "LibWaku Conf - toWakuConf":
     ## Then
     require wakuConfRes.isOk()
     let wakuConf = wakuConfRes.get()
+    require wakuConf.validate().isOk()
     require wakuConf.discv5Conf.isSome()
     check:
       wakuConf.discv5Conf.get().bootstrapNodes == bootstrapNodes
@@ -114,6 +117,7 @@ suite "LibWaku Conf - toWakuConf":
     ## Then
     require wakuConfRes.isOk()
     let wakuConf = wakuConfRes.get()
+    require wakuConf.validate().isOk()
     check:
       wakuConf.staticNodes == staticStoreNodes
 
@@ -143,6 +147,7 @@ suite "LibWaku Conf - toWakuConf":
     ## Then
     require wakuConfRes.isOk()
     let wakuConf = wakuConfRes.get()
+    require wakuConf.validate().isOk()
     check:
       wakuConf.maxMessageSizeBytes == 100'u64 * 1024'u64
 
@@ -164,6 +169,7 @@ suite "LibWaku Conf - toWakuConf":
                 contractAddress: "0x1234567890123456789012345678901234567890",
                 chainId: 1'u,
                 epochSizeSec: 600'u64,
+                rpcApiUrls: @["http://127.0.0.1:1111"],
               )
             ),
           )
@@ -173,11 +179,12 @@ suite "LibWaku Conf - toWakuConf":
     )
 
     ## When
-    let wakuConfRes = toWakuConf(libConf)
+    let wakuConf = toWakuConf(libConf).valueOr:
+      raiseAssert error
+
+    wakuConf.validate().isOkOr:
+      raiseAssert error
 
-    ## Then
-    require wakuConfRes.isOk()
-    let wakuConf = wakuConfRes.get()
     check:
       wakuConf.maxMessageSizeBytes == 150'u64 * 1024'u64
 
@@ -213,6 +220,7 @@ suite "LibWaku Conf - toWakuConf":
                 contractAddress: "0xAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
                 chainId: 5'u, # Goerli
                 epochSizeSec: 300'u64,
+                rpcApiUrls: @["https://127.0.0.1:8333"],
               )
             ),
           )
@@ -225,8 +233,10 @@ suite "LibWaku Conf - toWakuConf":
     let wakuConfRes = toWakuConf(libConf)
 
     ## Then
-    require wakuConfRes.isOk()
-    let wakuConf = wakuConfRes.get()
+    let wakuConf = wakuConfRes.valueOr:
+      raiseAssert error
+    wakuConf.validate().isOkOr:
+      raiseAssert error
 
     # Check basic settings
     check:
@@ -283,8 +293,10 @@ suite "LibWaku Conf - toWakuConf":
     let wakuConfRes = toWakuConf(libConf)
 
     ## Then
-    require wakuConfRes.isOk()
-    let wakuConf = wakuConfRes.get()
+    let wakuConf = wakuConfRes.valueOr:
+      raiseAssert error
+    wakuConf.validate().isOkOr:
+      raiseAssert error
     check:
       wakuConf.clusterId == 0
       wakuConf.shardingConf.kind == ShardingConfKind.StaticSharding