diff --git a/modules/explorer-core/src/main/resources/db/V9__Schema.sql b/modules/explorer-core/src/main/resources/db/V9__Schema.sql
index 12c8c21e8..3b0dd9c98 100644
--- a/modules/explorer-core/src/main/resources/db/V9__Schema.sql
+++ b/modules/explorer-core/src/main/resources/db/V9__Schema.sql
@@ -251,7 +251,7 @@ CREATE TABLE node_u_outputs
 
 CREATE INDEX "node_u_outputs__box_id" ON node_u_outputs (box_id);
 CREATE INDEX "node_u_outputs__tx_id" ON node_u_outputs (tx_id);
-CREATE INDEX "node_u_outputs__ergo_tree" ON node_u_outputs (ergo_tree);
+CREATE INDEX "node_u_outputs__ergo_tree" ON node_u_outputs using hash (ergo_tree);
 CREATE INDEX "node_u_outputs__ergo_tree_template_hash" ON node_u_outputs (ergo_tree_template_hash);
 
 /* Inputs containing in unconfirmed outputs.