diff --git a/eth/p2p.nim b/eth/p2p.nim
index d78c570..df0755e 100644
--- a/eth/p2p.nim
+++ b/eth/p2p.nim
@@ -111,7 +111,7 @@ proc connectToNetwork*(node: EthereumNode,
 
   while node.peerPool.connectedNodes.len == 0:
     trace "Waiting for more peers", peers = node.peerPool.connectedNodes.len
-    await sleepAsync(500)
+    await sleepAsync(500.milliseconds)
 
 proc stopListening*(node: EthereumNode) =
   node.listeningServer.stop()
diff --git a/eth/p2p/peer_pool.nim b/eth/p2p/peer_pool.nim
index ce3f86c..e73339c 100644
--- a/eth/p2p/peer_pool.nim
+++ b/eth/p2p/peer_pool.nim
@@ -8,7 +8,7 @@ import
 
 const
   lookupInterval = 5
-  connectLoopSleepMs = 2000
+  connectLoopSleep = chronos.milliseconds(2000)
 
 proc newPeerPool*(network: EthereumNode,
                   networkId: uint, keyPair: KeyPair,
@@ -179,7 +179,7 @@ proc run(p: PeerPool) {.async.} =
     if dropConnections:
       await p.stopAllPeers()
 
-    await sleepAsync(connectLoopSleepMs)
+    await sleepAsync(connectLoopSleep)
 
 proc start*(p: PeerPool) =
   if not p.running:
diff --git a/eth/p2p/rlpx_protocols/whisper_protocol.nim b/eth/p2p/rlpx_protocols/whisper_protocol.nim
index 0d4a824..c382fed 100644
--- a/eth/p2p/rlpx_protocols/whisper_protocol.nim
+++ b/eth/p2p/rlpx_protocols/whisper_protocol.nim
@@ -29,8 +29,8 @@ const
   whisperVersionStr* = $whisperVersion
   defaultMinPow* = 0.2'f64
   defaultMaxMsgSize* = 1024'u32 * 1024'u32 # * 10 # should be no higher than max RLPx size
-  messageInterval* = 300 ## Interval at which messages are send to peers, in ms
-  pruneInterval* = 1000 ## Interval at which message queue is pruned, in ms
+  messageInterval* = chronos.milliseconds(300) ## Interval at which messages are send to peers, in ms
+  pruneInterval* = chronos.milliseconds(1000)  ## Interval at which message queue is pruned, in ms
 
 type
   Hash* = MDigest[256]
diff --git a/tests/p2p/test_shh_connect.nim b/tests/p2p/test_shh_connect.nim
index 949bf38..592c45b 100644
--- a/tests/p2p/test_shh_connect.nim
+++ b/tests/p2p/test_shh_connect.nim
@@ -18,7 +18,7 @@ proc resetMessageQueues(nodes: varargs[EthereumNode]) =
 
 let bootENode = waitFor setupBootNode()
 let safeTTL = 5'u32
-let waitInterval = messageInterval + 150
+let waitInterval = messageInterval + 150.milliseconds
 
 var node1 = setupTestNode(Whisper)
 var node2 = setupTestNode(Whisper)
@@ -283,7 +283,7 @@ suite "Whisper connections":
     await sleepAsync(waitInterval)
     check node1.protocolState(Whisper).queue.items.len == 10
 
-    await sleepAsync(int((lowerTTL+1)*1000))
+    await sleepAsync(milliseconds((lowerTTL+1)*1000))
     check node1.protocolState(Whisper).queue.items.len == 0
     check node2.protocolState(Whisper).queue.items.len == 0