diff --git a/plone/app/z3cform/templates/image_input.pt b/plone/app/z3cform/templates/image_input.pt
index 7da7d43a..c4dd38e7 100644
--- a/plone/app/z3cform/templates/image_input.pt
+++ b/plone/app/z3cform/templates/image_input.pt
@@ -94,7 +94,7 @@
 
   <input class="form-control ${python:view.error and 'is-invalid' or ''}"
          id="${view/id}-input"
-         accept="${view/accept}"
+         accept="${view/accept|nothing}"
          disabled="${view/disabled}"
          maxlength="${view/maxlength}"
          name="${view/name}"