diff --git a/core/modules/options/config/schema/options.schema.yml b/core/modules/options/config/schema/options.schema.yml
index ac6a748..017b396 100644
--- a/core/modules/options/config/schema/options.schema.yml
+++ b/core/modules/options/config/schema/options.schema.yml
@@ -74,15 +74,15 @@ field.storage_settings.list_string:
       type: sequence
       label: 'Allowed values list'
       sequence:
-        - type: mapping
-          label: 'Allowed value with label'
-          mapping:
-            value:
-              type: string
-              label: 'Value'
-            label:
-              type: label
-              label: 'Label'
+        type: mapping
+        label: 'Allowed value with label'
+        mapping:
+          value:
+            type: string
+            label: 'Value'
+          label:
+            type: label
+            label: 'Label'
     allowed_values_function:
       type: string
       label: 'Allowed values function'