diff --git a/beacon_node/beacon_chain/src/canonical_head.rs b/beacon_node/beacon_chain/src/canonical_head.rs
index db071db166..1a08ac3f88 100644
--- a/beacon_node/beacon_chain/src/canonical_head.rs
+++ b/beacon_node/beacon_chain/src/canonical_head.rs
@@ -918,6 +918,13 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
                 .start_slot(T::EthSpec::slots_per_epoch()),
         );
 
+        self.observed_column_sidecars.write().prune(
+            new_view
+                .finalized_checkpoint
+                .epoch
+                .start_slot(T::EthSpec::slots_per_epoch()),
+        );
+
         self.observed_slashable.write().prune(
             new_view
                 .finalized_checkpoint