diff --git a/src/openforms/js/components/admin/form_design/registrations/json/JSONOptionsForm.js b/src/openforms/js/components/admin/form_design/registrations/json/JSONOptionsForm.js
index 8882b1b2d1..6001a1cacd 100644
--- a/src/openforms/js/components/admin/form_design/registrations/json/JSONOptionsForm.js
+++ b/src/openforms/js/components/admin/form_design/registrations/json/JSONOptionsForm.js
@@ -54,7 +54,7 @@ const JSONOptionsForm = ({name, label, schema, formData, onChange}) => {
       }
       initialFormData={{...formData}}
       onSubmit={values => onChange({formData: values})}
-      modalSize="small"
+      modalSize="medium"
     >
       <ValidationErrorsProvider errors={relevantErrors}>
         <Fieldset>