diff --git a/src/test/scala/io/iohk/ethereum/ledger/BlockImportSpec.scala b/src/test/scala/io/iohk/ethereum/ledger/BlockImportSpec.scala
index 1d6c2ea999..947a178803 100644
--- a/src/test/scala/io/iohk/ethereum/ledger/BlockImportSpec.scala
+++ b/src/test/scala/io/iohk/ethereum/ledger/BlockImportSpec.scala
@@ -3,7 +3,6 @@ package io.iohk.ethereum.ledger
 import akka.util.ByteString
 import akka.util.ByteString.{empty => bEmpty}
 import io.iohk.ethereum.blockchain.sync.EphemBlockchainTestSetup
-import io.iohk.ethereum.{Mocks, ObjectGenerators}
 import io.iohk.ethereum.domain.{Block, BlockHeader, BlockchainImpl, Receipt}
 import io.iohk.ethereum.ledger.BlockExecutionError.ValidationAfterExecError
 import io.iohk.ethereum.ledger.BlockQueue.Leaf
@@ -11,14 +10,16 @@ import io.iohk.ethereum.network.p2p.messages.PV62.BlockBody
 import io.iohk.ethereum.utils.Config.SyncConfig
 import io.iohk.ethereum.utils.{BlockchainConfig, Config}
 import io.iohk.ethereum.validators.BlockHeaderError.{HeaderDifficultyError, HeaderParentNotFoundError}
-import io.iohk.ethereum.validators.BlockHeaderValidator
+import io.iohk.ethereum.validators.OmmersValidator.{GetBlockHeaderByHash, GetNBlocksBack}
+import io.iohk.ethereum.validators.{BlockHeaderValidator, OmmersValidator, OmmersValidatorImpl}
+import io.iohk.ethereum.{Mocks, ObjectGenerators}
 //import io.iohk.ethereum.validators.BlockHeaderError.HeaderDifficultyError
 //import io.iohk.ethereum.validators._
 import org.scalamock.scalatest.MockFactory
 import org.scalatest.{FlatSpec, Matchers}
 
-import scala.language.reflectiveCalls
 import scala.collection.mutable
+import scala.language.reflectiveCalls
 
 
 class BlockImportSpec extends FlatSpec with Matchers with MockFactory {
@@ -249,6 +250,45 @@ class BlockImportSpec extends FlatSpec with Matchers with MockFactory {
     }
 
 
+  it should "correctly import block with ommers and ancestor in block queue " in new OmmersTestSetup  {
+    val ancestorForValidation = getBlock(0, difficulty = 1)
+    val ancestorForValidation1 = getBlock(1, difficulty = 2, parent = ancestorForValidation.header.hash)
+    val ancestorForValidation2 = getBlock(2, difficulty = 3, parent = ancestorForValidation1.header.hash)
+
+    val block1 = getBlock(bestNum - 2, difficulty = 100, parent = ancestorForValidation2.header.hash)
+    val ommerBlock = getBlock(bestNum - 1, difficulty = 101, parent = block1.header.hash)
+    val oldBlock2 = getBlock(bestNum - 1, difficulty = 102, parent = block1.header.hash)
+    val oldBlock3 = getBlock(bestNum, difficulty = 103, parent = oldBlock2.header.hash)
+    val newBlock2 = getBlock(bestNum - 1, difficulty = 102, parent = block1.header.hash)
+
+    val newBlock3WithOmmer = getBlock(bestNum, difficulty = 105, parent = newBlock2.header.hash, ommers = Seq(ommerBlock.header))
+
+
+    val td1 = block1.header.difficulty + 999
+    val oldTd2 = td1 + oldBlock2.header.difficulty
+    val oldTd3 = oldTd2 + oldBlock3.header.difficulty
+
+    val newTd2 = td1 + newBlock2.header.difficulty
+    val newTd3 = newTd2 + newBlock3WithOmmer.header.difficulty
+
+    blockchain.save(ancestorForValidation, Nil, 1, false)
+    blockchain.save(ancestorForValidation1, Nil, 3, false)
+    blockchain.save(ancestorForValidation2, Nil, 6, false)
+
+    blockchain.save(block1, Nil, td1, true)
+    blockchain.save(oldBlock2, receipts, oldTd2, true)
+    blockchain.save(oldBlock3, Nil, oldTd3, true)
+
+    ledger.setExecutionResult(newBlock2, Right(Nil))
+    ledger.setExecutionResult(newBlock3WithOmmer, Right(receipts))
+
+    ledger.importBlock(newBlock2) shouldEqual BlockEnqueued
+    ledger.importBlock(newBlock3WithOmmer) shouldEqual
+      ChainReorganised(List(oldBlock2, oldBlock3), List(newBlock2, newBlock3WithOmmer), List(newTd2, newTd3))
+
+    blockchain.getBestBlock() shouldEqual newBlock3WithOmmer
+  }
+
   trait TestSetup {
     val blockchainConfig = BlockchainConfig(Config.config)
     val blockQueue: BlockQueue
@@ -291,14 +331,15 @@ class BlockImportSpec extends FlatSpec with Matchers with MockFactory {
       number: BigInt = 1,
       difficulty: BigInt = 100,
       parent: ByteString = randomHash(),
-      salt: ByteString = randomHash()): Block =
+      salt: ByteString = randomHash(),
+      ommers: Seq[BlockHeader] = Nil): Block =
       Block(
         defaultHeader.copy(
           parentHash = parent,
           difficulty = difficulty,
           number = number,
           extraData = salt),
-        BlockBody(Nil, Nil))
+        BlockBody(Nil, ommers))
 
     def getChain(from: BigInt, to: BigInt, parent: ByteString = randomHash()): List[Block] =
       if (from > to)
@@ -363,4 +404,26 @@ class BlockImportSpec extends FlatSpec with Matchers with MockFactory {
       setHeaderByHash(header.parentHash, None)
     }
   }
+
+  trait OmmersTestSetup extends EphemBlockchain with TestSetup {
+    object OmmerValidation extends Mocks.MockValidatorsAlwaysSucceed {
+      override val ommersValidator: OmmersValidator =
+        (parentHash: ByteString,
+         blockNumber: BigInt,
+         ommers: Seq[BlockHeader],
+         getBlockHeaderByHash: GetBlockHeaderByHash,
+         getNBlocksBack: GetNBlocksBack) =>
+          new OmmersValidatorImpl(blockchainConfig, blockHeaderValidator).validate(parentHash, blockNumber, ommers, getBlockHeaderByHash, getNBlocksBack)
+    }
+
+    override lazy val ledger = new LedgerImpl(new Mocks.MockVM(), blockchain, blockQueue, blockchainConfig, OmmerValidation) {
+      private val results = mutable.Map[ByteString, Either[BlockExecutionError, Seq[Receipt]]]()
+
+      override def executeBlock(block: Block, alreadyValidated: Boolean = false): Either[BlockExecutionError, Seq[Receipt]] =
+        results(block.header.hash)
+
+      def setExecutionResult(block: Block, result: Either[BlockExecutionError, Seq[Receipt]]): Unit =
+        results(block.header.hash) = result
+    }
+  }
 }