diff --git a/x/mongo/driver/topology/topology.go b/x/mongo/driver/topology/topology.go
index ccb154b9e9..4b60ad2abd 100644
--- a/x/mongo/driver/topology/topology.go
+++ b/x/mongo/driver/topology/topology.go
@@ -809,24 +809,27 @@ func equalTopologies(topo1, topo2 description.Topology) bool {
 		return false
 	}
 
-	topoServers := make(map[string]description.Server, len(topo1.Servers))
-	for _, s := range topo1.Servers {
-		topoServers[s.Addr.String()] = s
+	topoServers := make(map[string]*description.Server, len(topo1.Servers))
+	for i := range topo1.Servers {
+		topoServers[topo1.Servers[i].Addr.String()] = &topo1.Servers[i]
 	}
 
-	otherServers := make(map[string]description.Server, len(topo2.Servers))
-	for _, s := range topo2.Servers {
-		otherServers[s.Addr.String()] = s
+	otherServers := make(map[string]*description.Server, len(topo2.Servers))
+	for i := range topo2.Servers {
+		otherServers[topo2.Servers[i].Addr.String()] = &topo2.Servers[i]
 	}
 
 	if len(topoServers) != len(otherServers) {
 		return false
 	}
 
-	for _, server := range topoServers {
-		otherServer := otherServers[server.Addr.String()]
+	for addr, server := range topoServers {
+		otherServer, ok := otherServers[addr]
+		if !ok {
+			return false
+		}
 
-		if !driverutil.EqualServers(server, otherServer) {
+		if !driverutil.EqualServers(*server, *otherServer) {
 			return false
 		}
 	}
diff --git a/x/mongo/driver/topology/topology_test.go b/x/mongo/driver/topology/topology_test.go
index b95c84fc54..e2a54dc05e 100644
--- a/x/mongo/driver/topology/topology_test.go
+++ b/x/mongo/driver/topology/topology_test.go
@@ -12,6 +12,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"path"
+	"strconv"
 	"sync/atomic"
 	"testing"
 	"time"
@@ -1040,3 +1041,57 @@ func BenchmarkSelectServerFromDescription(b *testing.B) {
 		})
 	}
 }
+
+func TestEqualTopologies(t *testing.T) {
+	assert.True(t, equalTopologies(
+		description.Topology{
+			Servers: []description.Server{{
+				Addr: "127.0.0.1:27017",
+			}},
+		}, description.Topology{
+			Servers: []description.Server{{
+				Addr: "127.0.0.1:27017",
+			}},
+		},
+	))
+	assert.False(t, equalTopologies(
+		description.Topology{
+			Servers: []description.Server{{
+				Addr: "127.0.0.1:27017",
+			}},
+		}, description.Topology{
+			Servers: []description.Server{{
+				Addr: "127.0.0.2:27017",
+			}},
+		},
+	))
+}
+
+func BenchmarkEqualTopologies(b *testing.B) {
+	for _, bsize := range []int{10, 100, 1000} {
+		b.Run(strconv.Itoa(bsize), func(b *testing.B) {
+			servers := make([]description.Server, bsize)
+			for i := 0; i < len(servers); i++ {
+				servers[i] = description.Server{
+					Addr:              address.Address("127.0.0." + strconv.Itoa(i) + ":27017"),
+					HeartbeatInterval: time.Duration(10) * time.Second,
+					LastWriteTime:     time.Date(2017, 2, 11, 14, 0, 0, 0, time.UTC),
+					LastUpdateTime:    time.Date(2017, 2, 11, 14, 0, 2, 0, time.UTC),
+					Kind:              description.ServerKindMongos,
+					WireVersion:       &description.VersionRange{Min: 6, Max: 21},
+				}
+			}
+			desc := description.Topology{
+				Servers: servers,
+			}
+
+			b.ResetTimer()
+			b.RunParallel(func(p *testing.PB) {
+				b.ReportAllocs()
+				for p.Next() {
+					_ = equalTopologies(desc, desc)
+				}
+			})
+		})
+	}
+}