diff --git a/src/common/options/global.yaml.in b/src/common/options/global.yaml.in
index 09a2fdd02b4..c26a9a9306c 100644
--- a/src/common/options/global.yaml.in
+++ b/src/common/options/global.yaml.in
@@ -1516,6 +1516,8 @@ options:
     at which some pools' pg_num may be shrunk in order to enable increasing the pg_num
     of others.
   default: 250
+  flags:
+  - runtime
   services:
   - mgr
   - mon