diff --git a/application/Espo/Core/Htmlizer/Htmlizer.php b/application/Espo/Core/Htmlizer/Htmlizer.php
index 61b9006ec1..d5c8bd224f 100644
--- a/application/Espo/Core/Htmlizer/Htmlizer.php
+++ b/application/Espo/Core/Htmlizer/Htmlizer.php
@@ -165,7 +165,7 @@ class Htmlizer
         if (!$skipInlineAttachmentHandling) {
             /** @var string $html */
             $html = preg_replace_callback(
-                '/\?entryPoint=attachment&id=([A-Za-z0-9]*)/',
+                '/\?entryPoint=attachment&id=([A-Za-z0-9\-]*)/',
                 function ($matches) {
                     $id = $matches[1];
 
diff --git a/application/Espo/Tools/Pdf/Dompdf/HtmlComposer.php b/application/Espo/Tools/Pdf/Dompdf/HtmlComposer.php
index f40b29466c..fe7f0ccd43 100644
--- a/application/Espo/Tools/Pdf/Dompdf/HtmlComposer.php
+++ b/application/Espo/Tools/Pdf/Dompdf/HtmlComposer.php
@@ -196,7 +196,7 @@ class HtmlComposer
         ) ?? '';
 
         return preg_replace_callback(
-            "/src=\"\?entryPoint=attachment&id=([A-Za-z0-9]*)\"/",
+            "/src=\"\?entryPoint=attachment&id=([A-Za-z0-9\-]*)\"/",
             function ($matches) {
                 $id = $matches[1];