diff --git a/src/Code/Converters/StlConverter.php b/src/Code/Converters/StlConverter.php
index 70cd895..dd5c2f6 100644
--- a/src/Code/Converters/StlConverter.php
+++ b/src/Code/Converters/StlConverter.php
@@ -6,7 +6,7 @@ class StlConverter implements ConverterContract
 {
     public function canParseFileContent($file_content)
     {
-        return preg_match('/^\d{2}:\d{2}:\d{2}:\d{2} , \d{2}:\d{2}:\d{2}:\d{2} , .+/m', $file_content) === 1;
+        return preg_match('/^\d{2}:\d{2}:\d{2}:\d{2}\s,\s\d{2}:\d{2}:\d{2}:\d{2}\s,.+/m', $file_content) === 1;
     }
 
     public function fileContentToInternalFormat($file_content, $original_file_content)
diff --git a/tests/formats/StlTest.php b/tests/formats/StlTest.php
index 7c7ef63..f3c7489 100644
--- a/tests/formats/StlTest.php
+++ b/tests/formats/StlTest.php
@@ -93,4 +93,19 @@ public function testTimesBiggerThan99HoursThrowException()
         $subtitles->content('stl');
     }
 
+    public function testClientFile()
+    {
+        $text = '
+$FadeOut			=	0
+$TapeOffset			=	TRUE
+ 
+$HorzAlign	=	Center
+'."00:00:00:00\t,\t00:00:01:00\t,\ta
+00:00:01:00\t,\t00:00:02:00\t,\tb
+";
+
+        $actual = Subtitles::loadFromString($text)->getInternalFormat();
+        $expected = (new Subtitles())->add(0, 1, 'a')->add(1, 2, 'b')->getInternalFormat();
+        $this->assertInternalFormatsEqual($expected, $actual);
+    }
 }
\ No newline at end of file