diff --git a/application/Espo/Core/Utils/Util.php b/application/Espo/Core/Utils/Util.php
index dd39e36056..a7a4fbbf65 100644
--- a/application/Espo/Core/Utils/Util.php
+++ b/application/Espo/Core/Utils/Util.php
@@ -704,7 +704,7 @@ class Util
     public static function sanitizeFileName(string $fileName): string
     {
         /** @var string */
-        return preg_replace("/([^\w\s\d\-_~,;:\[\]\(\).])/u", '_', $fileName);
+        return preg_replace("/([^\w\d\-_~,;:\[\]\(\).])/u", '_', $fileName);
     }
 
     /**
diff --git a/tests/unit/Espo/Core/Utils/UtilTest.php b/tests/unit/Espo/Core/Utils/UtilTest.php
index 7a649b4921..0ce66610ce 100644
--- a/tests/unit/Espo/Core/Utils/UtilTest.php
+++ b/tests/unit/Espo/Core/Utils/UtilTest.php
@@ -1660,4 +1660,22 @@ class UtilTest extends TestCase
     {
         $this->assertEquals($expectedResult, Util::urlRemoveParam($url, $paramName, $suffix));
     }
+
+    /**
+     * @return string[]
+     */
+    static public function sanitizeFileNameList(): array
+    {
+        return [
+            ['test%', 'test_'],
+            ["test\n", 'test_'],
+            ["test test", 'test_test'],
+        ];
+    }
+
+    #[DataProvider('sanitizeFileNameList')]
+    public function testSanitizeFileName(string $input, string $expected): void
+    {
+        $this->assertEquals($expected, Util::sanitizeFileName($input));
+    }
 }