diff --git a/src/Search/Comb/Comb.php b/src/Search/Comb/Comb.php
index caab9e1c03a..d51c652f3b7 100644
--- a/src/Search/Comb/Comb.php
+++ b/src/Search/Comb/Comb.php
@@ -1009,8 +1009,12 @@ private function filterStopWords($words)
             return $words;
         }
 
+        $lowercasedStopWords = collect($this->stop_words)
+            ->map(fn ($word) => Str::lower($word))
+            ->all();
+
         foreach ($words as $key => $word) {
-            if (in_array($word, $this->stop_words)) {
+            if (in_array(Str::lower($word), $lowercasedStopWords)) {
                 unset($words[$key]);
             }
         }
diff --git a/tests/Search/CombTest.php b/tests/Search/CombTest.php
index 897dea3fe21..44584920740 100644
--- a/tests/Search/CombTest.php
+++ b/tests/Search/CombTest.php
@@ -281,6 +281,22 @@ public function it_filters_out_results_with_disallowed_words_where_results_are_a
         $this->assertEquals(['Chicken & Sweetcorn Soup'], collect($results['data'] ?? [])->pluck('data.title')->all());
     }
 
+    #[Test]
+    public function it_handles_stop_words_case_insensitive()
+    {
+        $comb = new Comb([
+            ['title' => 'One two three'],
+            ['title' => 'Three four five'],
+            ['title' => 'Five four three'],
+        ]);
+
+        $comb->setSettings(['stop_words' => ['Three']]);
+
+        $results = $comb->lookUp('One two three');
+
+        $this->assertEquals(['One two three'], collect($results['data'] ?? [])->pluck('data.title')->all());
+    }
+
     public static function searchesProvider()
     {
         return [