diff --git a/alloc.go b/alloc.go
index 2ad4bed..a116a79 100644
--- a/alloc.go
+++ b/alloc.go
@@ -47,15 +47,15 @@ func (a *GenericAlloc) Alloc() (ip *net.IPAddr, err error) {
 	pos := c.Next()
 	last := c.Last()
 	for ; pos != nil && pos != last; pos = c.Next() {
-		net := &net.IPAddr{IP: pos.IP}
-		cidr := a.CIDR(net)
+		n := &net.IPAddr{IP: pos.IP}
+		cidr := a.CIDR(n)
 		ok, e := a.store.Exists(cidr)
 		if e != nil {
 			return nil, e
 		}
 		if !ok {
 			a.store.Add(cidr)
-			ip = net
+			ip = n
 			return
 		}
 	}