diff --git a/src/Sieve.php b/src/Sieve.php
index 36ac48e..136b099 100644
--- a/src/Sieve.php
+++ b/src/Sieve.php
@@ -81,12 +81,12 @@ public function apply($queryBuilder)
             }
 
             if ($this->getSort() == "$property:asc_nulls_last") {
-                $queryBuilder->orderByRaw("ISNULL(\"$column\") asc")
+                $queryBuilder->orderByRaw("ISNULL($column) asc")
                     ->orderBy($column, 'asc');
             }
 
             if ($this->getSort() == "$property:desc_nulls_first") {
-                $queryBuilder->orderByRaw("ISNULL(\"$column\") desc")
+                $queryBuilder->orderByRaw("ISNULL($column) desc")
                     ->orderBy($column, 'desc');
             }
         }
diff --git a/tests/SieveTest.php b/tests/SieveTest.php
index 6026b06..6e7f5b5 100644
--- a/tests/SieveTest.php
+++ b/tests/SieveTest.php
@@ -93,7 +93,7 @@ public function applies_sieve_sorts_to_a_query_builder_asc_nulls_last()
         $seive->apply($builder);
 
         $this->assertEquals(
-            'select * from "pets" order by ISNULL("name") asc, "name" asc',
+            'select * from "pets" order by ISNULL(name) asc, "name" asc',
             $builder->toSql()
         );
     }
@@ -117,7 +117,7 @@ public function applies_sieve_sorts_to_a_query_builder_desc_nulls_first()
         $seive->apply($builder);
 
         $this->assertEquals(
-            'select * from "pets" order by ISNULL("name") desc, "name" desc',
+            'select * from "pets" order by ISNULL(name) desc, "name" desc',
             $builder->toSql()
         );
     }