diff --git a/apps/explorer/priv/repo/migrations/scripts/20190326202921_lose_consensus_for_invalid_blocks.sql b/apps/explorer/priv/repo/migrations/scripts/20190326202921_lose_consensus_for_invalid_blocks.sql
new file mode 100644
index 0000000000..38e8678484
--- /dev/null
+++ b/apps/explorer/priv/repo/migrations/scripts/20190326202921_lose_consensus_for_invalid_blocks.sql
@@ -0,0 +1,6 @@
+UPDATE blocks SET consensus = FALSE
+WHERE number IN (
+  SELECT b0.number - 1 FROM "blocks" AS b0
+  LEFT JOIN "blocks" AS b1 ON (b0."parent_hash" = b1."hash") AND b1."consensus"
+  WHERE b0."number" > 0 AND b0."consensus" AND b1."hash" IS NULL
+);