diff --git a/validations/ctlplane-ip-range.yaml b/validations/ctlplane-ip-range.yaml
index 0f5949440..a89ba7421 100644
--- a/validations/ctlplane-ip-range.yaml
+++ b/validations/ctlplane-ip-range.yaml
@@ -8,7 +8,7 @@
         `dhcp_end` fields in `undercloud.conf` is not too low.
       groups:
         - pre-introspection
-    ctlplane_iprange_min_size: 25
+    ctlplane_iprange_min_size: 20
   tasks:
   - name: Get the path of tripleo undercloud config file
     become: true