diff --git a/application/Espo/Core/HookManager.php b/application/Espo/Core/HookManager.php
index 36d36e525e..6559ab781a 100644
--- a/application/Espo/Core/HookManager.php
+++ b/application/Espo/Core/HookManager.php
@@ -228,7 +228,7 @@ class HookManager
 
         foreach ($hookData as $key => $hookList) {
             foreach ($hookList as $rowHookName) {
-                if (preg_match('/\\'.$class.'$/', $rowHookName)) {
+                if (preg_match('/\\\\'.$class.'$/', $rowHookName)) {
                     return true;
                 }
             }