diff --git a/eth2/utils/slot_clock/src/system_time_slot_clock.rs b/eth2/utils/slot_clock/src/system_time_slot_clock.rs
index 5c5f2e0ea..ba62b3b93 100644
--- a/eth2/utils/slot_clock/src/system_time_slot_clock.rs
+++ b/eth2/utils/slot_clock/src/system_time_slot_clock.rs
@@ -10,6 +10,7 @@ pub enum Error {
 }
 
 /// Determines the present slot based upon the present system time.
+#[derive(Clone)]
 pub struct SystemTimeSlotClock {
     genesis_seconds: u64,
     slot_duration_seconds: u64,