diff --git a/core/modules/image/config/schema/image.schema.yml b/core/modules/image/config/schema/image.schema.yml
index cc621c1..5c6536a 100644
--- a/core/modules/image/config/schema/image.schema.yml
+++ b/core/modules/image/config/schema/image.schema.yml
@@ -92,8 +92,24 @@ field.image.settings:
       type: string
       label: 'Upload destination'
     default_image:
-      type: string
+      type: mapping
       label: 'Default image'
+      mapping:
+        fid:
+          type: integer
+          label: 'Image'
+        alt:
+          type: label
+          label: 'Alternate text'
+        title:
+          type: label
+          label: 'Title'
+        width:
+          type: integer
+          label: 'Width'
+        height:
+          type: integer
+          label: 'Height'
     column_groups:
       type: mapping
       label: 'Column groups'