diff --git a/core/config/schema/core.data_types.schema.yml b/core/config/schema/core.data_types.schema.yml
index 616e7ef826..a11eedcbc0 100644
--- a/core/config/schema/core.data_types.schema.yml
+++ b/core/config/schema/core.data_types.schema.yml
@@ -764,7 +764,7 @@ field.value.timestamp:
   label: 'Timestamp value'
   mapping:
     value:
-      type: integer
+      type: timestamp
       label: 'Value'
 
 # Text with a text format.