diff --git a/pageserver/src/http/openapi_spec.yml b/pageserver/src/http/openapi_spec.yml
index 087d281a0c..59e646d0ca 100644
--- a/pageserver/src/http/openapi_spec.yml
+++ b/pageserver/src/http/openapi_spec.yml
@@ -414,7 +414,7 @@ paths:
         Either archives or unarchives the given timeline.
         An archived timeline may not have any non-archived children.
       requestBody:
-        required: false
+        required: true
         content:
           application/json:
             schema: