diff --git a/lib/ansible/modules/cloud/openstack/os_subnet.py b/lib/ansible/modules/cloud/openstack/os_subnet.py
index 613ec1873f..d4efe8727f 100644
--- a/lib/ansible/modules/cloud/openstack/os_subnet.py
+++ b/lib/ansible/modules/cloud/openstack/os_subnet.py
@@ -176,7 +176,7 @@ def _can_update(subnet, module, cloud):
                                       subnet')
     if ip_version and subnet['ip_version'] != ip_version:
         module.fail_json(msg='Cannot update ip_version in existing subnet')
-    if ipv6_ra_mode and subnet.get('ipv6_ra_mode', None) != ip_version:
+    if ipv6_ra_mode and subnet.get('ipv6_ra_mode', None) != ipv6_ra_mode:
         module.fail_json(msg='Cannot update ipv6_ra_mode in existing subnet')
     if ipv6_a_mode and subnet.get('ipv6_address_mode', None) != ipv6_a_mode:
         module.fail_json(msg='Cannot update ipv6_address_mode in existing \