diff --git a/beacon_chain/block_pools/clearance.nim b/beacon_chain/block_pools/clearance.nim
index a3753bcd2..b7f4bde69 100644
--- a/beacon_chain/block_pools/clearance.nim
+++ b/beacon_chain/block_pools/clearance.nim
@@ -232,6 +232,10 @@ proc addRawBlock*(
 
   if blck.parent_root in quarantine.missing or
       blck.parent_root in quarantine.orphans:
+    debug "Unresolved block (parent missing or orphaned)",
+      orphans = quarantine.orphans.len,
+      missing = quarantine.missing.len
+
     return err MissingParent
 
   # This is an unresolved block - put its parent on the missing list for now...
diff --git a/beacon_chain/block_pools/quarantine.nim b/beacon_chain/block_pools/quarantine.nim
index 0c58a8db6..5872b2629 100644
--- a/beacon_chain/block_pools/quarantine.nim
+++ b/beacon_chain/block_pools/quarantine.nim
@@ -49,4 +49,5 @@ func add*(quarantine: var QuarantineRef, dag: ChainDAGRef,
   quarantine.orphans[sblck.root] = sblck
 
   let parentRoot = sblck.message.parent_root
-  quarantine.addMissing(parentRoot)
+  if parentRoot notin quarantine.orphans:
+    quarantine.addMissing(parentRoot)