diff --git a/client.go b/client.go
index 162448a..241bc9f 100644
--- a/client.go
+++ b/client.go
@@ -901,6 +901,7 @@ func (c *HostClient) connsCleaner() {
 			// Do not copy(c.conns, c.conns[1:]), since this may be
 			// quite slow for multi-million conns count.
 			// Just move c.conns one position ahead.
+			c.conns[0] = nil
 			c.conns = c.conns[1:]
 		}
 		if c.connsCount == 0 {
diff --git a/workerpool.go b/workerpool.go
index 6119a62..aeaf929 100644
--- a/workerpool.go
+++ b/workerpool.go
@@ -87,6 +87,7 @@ func (wp *workerPool) clean() {
 		// do not do copy(chans, chans[1:]), since this may be quite slow
 		// for multi-million concurrent connections. Just move chans
 		// pointer one position ahead.
+		chans[0] = nil
 		chans = chans[1:]
 		wp.workersCount--
 	}