diff --git a/slasher/db/iface/interface.go b/slasher/db/iface/interface.go
index 77f418f672..726c593e0e 100644
--- a/slasher/db/iface/interface.go
+++ b/slasher/db/iface/interface.go
@@ -22,8 +22,8 @@ type ReadOnlyDatabase interface {
 	GetLatestEpochDetected(ctx context.Context) (uint64, error)
 
 	// BlockHeader related methods.
-	BlockHeaders(ctx context.Context, epoch uint64, validatorID uint64) ([]*ethpb.SignedBeaconBlockHeader, error)
-	HasBlockHeader(ctx context.Context, epoch uint64, validatorID uint64) bool
+	BlockHeaders(ctx context.Context, slot uint64, validatorID uint64) ([]*ethpb.SignedBeaconBlockHeader, error)
+	HasBlockHeader(ctx context.Context, slot uint64, validatorID uint64) bool
 
 	// IndexedAttestations related methods.
 	HasIndexedAttestation(ctx context.Context, att *ethpb.IndexedAttestation) (bool, error)