diff --git a/catchup/catchpointService.go b/catchup/catchpointService.go
index 5d01fa9608..e2a9fcc387 100644
--- a/catchup/catchpointService.go
+++ b/catchup/catchpointService.go
@@ -473,8 +473,10 @@ func lookbackForStateproofsSupport(topBlock *bookkeeping.Block) uint64 {
 		return 0
 	}
 	lowestStateProofRound := stateproof.GetOldestExpectedStateProof(&topBlock.BlockHeader)
-	// in order to be able to confirm lowestStateProofRound we need to have round number: (lowestStateProofRound - stateproofInterval)
+	// in order to be able to confirm/build lowestStateProofRound we would need to reconstruct
+	// the corresponding voterForRound which is (lowestStateProofRound - stateproofInterval - VotersLookback)
 	lowestStateProofRound = lowestStateProofRound.SubSaturate(basics.Round(proto.StateProofInterval))
+	lowestStateProofRound = lowestStateProofRound.SubSaturate(basics.Round(proto.StateProofVotersLookback))
 	return uint64(topBlock.Round().SubSaturate(lowestStateProofRound))
 }
 
diff --git a/catchup/service_test.go b/catchup/service_test.go
index 679ee3239e..676a283bad 100644
--- a/catchup/service_test.go
+++ b/catchup/service_test.go
@@ -988,7 +988,7 @@ func TestDownloadBlocksToSupportStateProofs(t *testing.T) {
 
 	lookback := lookbackForStateproofsSupport(&topBlk)
 	oldestRound := topBlk.BlockHeader.Round.SubSaturate(basics.Round(lookback))
-	assert.Equal(t, uint64(oldestRound), 512-config.Consensus[protocol.ConsensusFuture].StateProofInterval)
+	assert.Equal(t, uint64(oldestRound), 512-config.Consensus[protocol.ConsensusFuture].StateProofInterval-config.Consensus[protocol.ConsensusFuture].StateProofVotersLookback)
 
 	// the network has made progress and now it is on round 8000. in this case we would not download blocks to cover 512.
 	// instead, we will download blocks to confirm only the recovery period lookback.
@@ -1002,7 +1002,9 @@ func TestDownloadBlocksToSupportStateProofs(t *testing.T) {
 	lookback = lookbackForStateproofsSupport(&topBlk)
 	oldestRound = topBlk.BlockHeader.Round.SubSaturate(basics.Round(lookback))
 
-	lowestRoundToRetain := 8000 - (8000 % 256) - (config.Consensus[protocol.ConsensusCurrentVersion].StateProofInterval * (config.Consensus[protocol.ConsensusCurrentVersion].StateProofMaxRecoveryIntervals + 1))
+	lowestRoundToRetain := 8000 - (8000 % config.Consensus[protocol.ConsensusCurrentVersion].StateProofInterval) -
+		config.Consensus[protocol.ConsensusCurrentVersion].StateProofInterval*(config.Consensus[protocol.ConsensusCurrentVersion].StateProofMaxRecoveryIntervals+1) - config.Consensus[protocol.ConsensusFuture].StateProofVotersLookback
+
 	assert.Equal(t, uint64(oldestRound), lowestRoundToRetain)
 
 	topBlk = bookkeeping.Block{}