diff --git a/quicp2p.nim b/quicp2p.nim
index ebac3f9..051fe2d 100644
--- a/quicp2p.nim
+++ b/quicp2p.nim
@@ -172,25 +172,27 @@ proc initContext(sock: AsyncSocket, certChainPath: string, keyPath: string,
   result.tlsCtx.signCertificate = addr result.signCertificate.super
 
 proc sendPackets(ctx: QuicP2PContext) =
-  for c in ctx.connections:
+  let conns = ctx.connections
+  for i in 0 .. conns.len - 1:
     var srcAddr, dstAddr: quicly_address_t
     var dgrams: array[10, IOVec]
     var dgramCount = dgrams.len().csize_t
     var dgramsBuf = newString(dgramCount * ctx.quiclyCtx.transport_params.max_udp_payload_size)
-    let sendResult = quicly_send(c, addr dstAddr, addr srcAddr, addr dgrams[0],
-                                 addr dgramCount, addr dgramsBuf[0],
-                                 dgramsBuf.len().csize_t)
+    let sendResult = quicly_send(conns[i], addr dstAddr, addr srcAddr,
+                                 addr dgrams[0], addr dgramCount,
+                                 addr dgramsBuf[0], dgramsBuf.len().csize_t)
     case sendResult:
     of 0:
       if dgramCount > 0:
         echo &"sending {dgramCount} datagrams"
-        for i in 0 .. dgramCount - 1:
+        for j in 0 .. dgramCount - 1:
           var sockLen = quicly_get_socklen(addr dstAddr.sa)
           # TODO: replace asyncdispatch.sendTo with asyncnet.sendTo (Nim 1.4 required)
-          asyncCheck sendTo(ctx.sock.getFd().AsyncFD, dgrams[i].iov_base,
-                            dgrams[i].iov_len.int, addr dstAddr.sa, sockLen)
+          asyncCheck sendTo(ctx.sock.getFd().AsyncFD, dgrams[j].iov_base,
+                            dgrams[j].iov_len.int, addr dstAddr.sa, sockLen)
     of QUICLY_ERROR_FREE_CONNECTION:
-      ctx.connections.del(ctx.connections.find(c))
+      let c = ctx.connections[i]
+      ctx.connections.del(i)
       quicly_free(c)
     else:
       raise newException(ValueError, &"quicly_send returned {sendResult}")