diff --git a/pkg/datastore/postgres/repositories/block_repository.go b/pkg/datastore/postgres/repositories/block_repository.go
index c1c6cfbe..74018296 100644
--- a/pkg/datastore/postgres/repositories/block_repository.go
+++ b/pkg/datastore/postgres/repositories/block_repository.go
@@ -56,11 +56,11 @@ func (blockRepository BlockRepository) MissingBlockNumbers(startingBlockNumber i
 	numbers := make([]int64, 0)
 	blockRepository.database.Select(&numbers,
 		`SELECT all_block_numbers
-            FROM (
-                SELECT generate_series($1::INT, $2::INT) AS all_block_numbers) series
-                LEFT JOIN blocks
-                    ON number = all_block_numbers
-            WHERE number ISNULL OR eth_node_fingerprint != $3`,
+          FROM (
+              SELECT generate_series($1::INT, $2::INT) AS all_block_numbers) series
+          WHERE all_block_numbers NOT IN (
+		  	  SELECT number FROM blocks WHERE eth_node_fingerprint = $3
+		  ) `,
 		startingBlockNumber,
 		highestBlockNumber, nodeId)
 	return numbers
diff --git a/pkg/datastore/postgres/repositories/block_repository_test.go b/pkg/datastore/postgres/repositories/block_repository_test.go
index 1b2c64fc..93ffe650 100644
--- a/pkg/datastore/postgres/repositories/block_repository_test.go
+++ b/pkg/datastore/postgres/repositories/block_repository_test.go
@@ -241,6 +241,23 @@ var _ = Describe("Saving blocks", func() {
 			Expect(len(blockRepository.MissingBlockNumbers(1, 1, node.ID))).To(Equal(0))
 		})
 
+		It("is empty if copies of block exist from both current node and another", func() {
+			blockRepository.CreateOrUpdateBlock(core.Block{Number: 0})
+			blockRepository.CreateOrUpdateBlock(core.Block{Number: 1})
+			nodeTwo := core.Node{
+				GenesisBlock: "0x456",
+				NetworkID:    1,
+			}
+			dbTwo, err := postgres.NewDB(test_config.DBConfig, nodeTwo)
+			Expect(err).NotTo(HaveOccurred())
+			repositoryTwo := repositories.NewBlockRepository(dbTwo)
+			repositoryTwo.CreateOrUpdateBlock(core.Block{Number: 0})
+
+			missing := blockRepository.MissingBlockNumbers(0, 1, node.ID)
+
+			Expect(len(missing)).To(BeZero())
+		})
+
 		It("is the only missing block number", func() {
 			blockRepository.CreateOrUpdateBlock(core.Block{Number: 2})