diff --git a/lib/queryBuilder/transformations/WrapMysqlModifySubqueryTransformation.js b/lib/queryBuilder/transformations/WrapMysqlModifySubqueryTransformation.js
index cd2caf2d6..45753f53d 100644
--- a/lib/queryBuilder/transformations/WrapMysqlModifySubqueryTransformation.js
+++ b/lib/queryBuilder/transformations/WrapMysqlModifySubqueryTransformation.js
@@ -2,6 +2,8 @@
 
 const { QueryTransformation } = require('./QueryTransformation');
 const { isMySql } = require('../../utils/knexUtils');
+const { once } = require('../../utils/objectUtils');
+const getJoinBuilder = once(() => require('../JoinBuilder').JoinBuilder);
 
 /**
  * Mysql doesn't allow queries like this:
@@ -30,6 +32,13 @@ class WrapMysqlModifySubqueryTransformation extends QueryTransformation {
       return query;
     }
 
+    // This transformation should not apply to join builder, otherwise it causes:
+    // "TypeError: parentQuery.isUpdate is not a function"
+    const JoinBuilder = getJoinBuilder();
+    if (parentQuery instanceof JoinBuilder) {
+      return query;
+    }
+
     // This transformation only applies to update and delete queries.
     if (!parentQuery.isUpdate() && !parentQuery.isDelete()) {
       return query;