diff --git a/modules/document/document.class.php b/modules/document/document.class.php
index 032a9ec06..82d34909b 100644
--- a/modules/document/document.class.php
+++ b/modules/document/document.class.php
@@ -113,6 +113,7 @@ class Document extends ModuleObject
 		// 2025.10.23 Add sort to document_extra_keys table, and sort_value to document_extra_vars table
 		if(!$oDB->isColumnExists('document_extra_keys', 'var_sort')) return true;
 		if(!$oDB->isColumnExists('document_extra_vars', 'sort_value') || !$oDB->isIndexExists('document_extra_vars', 'idx_sort_value')) return true;
+		if(!$oDB->isIndexExists('document_extra_vars', 'idx_prefix_value')) return true;
 
 		// Delete unnecessary index
 		if($oDB->isIndexExists('document_extra_vars', 'idx_document_list_order')) return true;
@@ -263,6 +264,10 @@ class Document extends ModuleObject
 			$oDB->commit();
 			$oDB->addIndex('document_extra_vars', 'idx_sort_value', array('module_srl', 'sort_value'));
 		}
+		if(!$oDB->isIndexExists('document_extra_vars', 'idx_prefix_value'))
+		{
+			$oDB->addIndex('document_extra_vars', 'idx_prefix_value', array('module_srl', 'value(10)'));
+		}
 
 		// Delete unnecessary index
 		if($oDB->isIndexExists('document_extra_vars', 'idx_document_list_order'))
diff --git a/modules/document/schemas/document_extra_vars.xml b/modules/document/schemas/document_extra_vars.xml
index dc3455a3d..f1707a66a 100644
--- a/modules/document/schemas/document_extra_vars.xml
+++ b/modules/document/schemas/document_extra_vars.xml
@@ -6,5 +6,6 @@
 	<column name="value" type="bigtext" />
 	<column name="sort_value" type="bigint" />
 	<column name="eid" type="varchar" size="40" />
+	<index name="idx_prefix_value" columns="module_srl,value(10)" />
 	<index name="idx_sort_value" columns="module_srl,sort_value" />
 </table>