diff --git a/pkg/tcpip/network/internal/multicast/example_test.go b/pkg/tcpip/network/internal/multicast/example_test.go
index 3a8b13581..08a187d35 100644
--- a/pkg/tcpip/network/internal/multicast/example_test.go
+++ b/pkg/tcpip/network/internal/multicast/example_test.go
@@ -103,7 +103,7 @@ func Example() {
 		panic(fmt.Sprintf("table.GetLastUsedTimestamp(%#v) = (_, false)", routeKey))
 	}
 
-	fmt.Printf("Last used timestamp: %d", timestamp.Nanoseconds())
+	fmt.Printf("Last used timestamp: %s", timestamp)
 
 	// Finally, to remove an installed route, call:
 	if removed := table.RemoveInstalledRoute(routeKey); !removed {
diff --git a/pkg/tcpip/network/internal/multicast/route_table_test.go b/pkg/tcpip/network/internal/multicast/route_table_test.go
index 08cf9e95c..8a60f93cb 100644
--- a/pkg/tcpip/network/internal/multicast/route_table_test.go
+++ b/pkg/tcpip/network/internal/multicast/route_table_test.go
@@ -452,8 +452,8 @@ func TestSetLastUsedTimestamp(t *testing.T) {
 				t.Fatalf("got table.GetLastUsedTimestamp(%#v) = (_, false_), want = (_, true)", defaultRouteKey)
 			}
 
-			if got, want := timestamp.Nanoseconds(), test.wantLastUsedTime.Nanoseconds(); got != want {
-				t.Errorf("got table.GetLastUsedTimestamp(%#v) = (%v, _), want (%v, _)", defaultRouteKey, got, want)
+			if timestamp != test.wantLastUsedTime {
+				t.Errorf("got table.GetLastUsedTimestamp(%#v) = (%s, _), want = (%s, _)", defaultRouteKey, timestamp, test.wantLastUsedTime)
 			}
 		})
 	}
diff --git a/pkg/tcpip/tcpip.go b/pkg/tcpip/tcpip.go
index 11dae0c18..b54930f69 100644
--- a/pkg/tcpip/tcpip.go
+++ b/pkg/tcpip/tcpip.go
@@ -71,9 +71,9 @@ type MonotonicTime struct {
 	nanoseconds int64
 }
 
-// Nanoseconds returns the monotonic time in nanoseconds.
-func (mt MonotonicTime) Nanoseconds() int64 {
-	return mt.nanoseconds
+// String implements Stringer.
+func (mt MonotonicTime) String() string {
+	return strconv.FormatInt(mt.nanoseconds, 10)
 }
 
 // Before reports whether the monotonic clock reading mt is before u.