diff --git a/src/Grid/Model.php b/src/Grid/Model.php
index 5949056f20..32036fb582 100644
--- a/src/Grid/Model.php
+++ b/src/Grid/Model.php
@@ -526,6 +526,9 @@ protected function setSort()
 
         $columnNameContainsDots = Str::contains($columnName, '.');
         $isRelation = $this->queries->contains(function ($query) use ($columnName) {
+            // relationship should be camel case
+            $columnName = Str::camel(Str::before($columnName, '.'));
+
             return $query['method'] === 'with' && in_array($columnName, $query['arguments'], true);
         });
         if ($columnNameContainsDots === true && $isRelation) {
@@ -570,6 +573,8 @@ protected function setSort()
     protected function setRelationSort($column)
     {
         list($relationName, $relationColumn) = explode('.', $column);
+        // relationship should be camel case
+        $relationName = Str::camel($relationName);
 
         if ($this->queries->contains(function ($query) use ($relationName) {
             return $query['method'] == 'with' && in_array($relationName, $query['arguments']);