diff --git a/p2p/switch_test.go b/p2p/switch_test.go
index 8fec3e7ab..c02eb26d3 100644
--- a/p2p/switch_test.go
+++ b/p2p/switch_test.go
@@ -91,8 +91,8 @@ func MakeSwitchPair(t testing.TB, initSwitch func(int, *Switch) *Switch) (*Switc
 
 func initSwitchFunc(i int, sw *Switch) *Switch {
 	sw.SetAddrBook(&addrBookMock{
-		addrs:    make(map[string]struct{}, 0),
-		ourAddrs: make(map[string]struct{}, 0)})
+		addrs:    make(map[string]struct{}),
+		ourAddrs: make(map[string]struct{})})
 
 	// Make two reactors of two channels each
 	sw.AddReactor("foo", NewTestReactor([]*conn.ChannelDescriptor{