diff --git a/lib/pg.js b/lib/pg.js
index 2af7051..ab0d9c4 100644
--- a/lib/pg.js
+++ b/lib/pg.js
@@ -48,6 +48,20 @@ const createIndex = (entityName, indexName, def, entity) => {
   const fieldNames = [];
   const fieldList = unique || index;
   const indexFields = typeof fieldList === 'boolean' ? [indexName] : fieldList;
+  const indexMethods = ['btree', 'hash', 'gin', 'gist', 'spgist', 'brin'];
+  const maxMethodLength = indexMethods.reduce(
+    (prev, curr) => (prev.length > curr.length ? prev : curr),
+    '',
+  ).length;
+  const idxName = `"${prefix}${entityName}${toUpperCamel(indexName)}"`;
+  if (typeof indexFields === 'string') {
+    const hasMethod = indexMethods.some((method) =>
+      indexFields.substring(0, maxMethodLength).includes(method),
+    );
+    if (hasMethod)
+      return `CREATE ${uni}INDEX ${idxName} ON "${entityName}" USING ${indexFields};`;
+    return `CREATE ${uni}INDEX ${idxName} ON "${entityName}" ${indexFields};`;
+  }
   fieldNames.push(...indexFields);
   const names = [];
   for (const name of fieldNames) {
@@ -56,7 +70,6 @@ const createIndex = (entityName, indexName, def, entity) => {
     names.push(isFirstUpper(field.type) ? name + 'Id' : name);
   }
   const fields = '("' + names.join('", "') + '")';
-  const idxName = `"${prefix}${entityName}${toUpperCamel(indexName)}"`;
   return `CREATE ${uni}INDEX ${idxName} ON "${entityName}" ${fields};`;
 };