diff --git a/cmsplugin_pdf/models.py b/cmsplugin_pdf/models.py
index c893d5c..0e9b5ca 100644
--- a/cmsplugin_pdf/models.py
+++ b/cmsplugin_pdf/models.py
@@ -36,6 +36,7 @@ class PDFPluginModel(CMSPlugin):
 
     file = FilerFileField(
         verbose_name=_('File'),
+        on_delete=models.CASCADE,
     )
 
     image = models.ImageField(