diff --git a/gso/workflows/__init__.py b/gso/workflows/__init__.py
index f69279021b2fae317e08094b3aae013ff14bcda7..8b1f4065d11869daa09e3ab124caf4b7484a89e0 100644
--- a/gso/workflows/__init__.py
+++ b/gso/workflows/__init__.py
@@ -1,6 +1,6 @@
 """Initialisation class that imports all workflows into GSO."""
 
-from orchestrator.services.subscriptions import WF_USABLE_MAP
+from orchestrator.services.subscriptions import WF_USABLE_MAP, WF_USABLE_WHILE_OUT_OF_SYNC
 from orchestrator.types import SubscriptionLifecycle
 from orchestrator.workflows import LazyWorkflowInstance
 
@@ -28,6 +28,8 @@ WF_USABLE_MAP.update({
     "validate_iptrunk": [SubscriptionLifecycle.PROVISIONING, SubscriptionLifecycle.ACTIVE],
 })
 
+WF_USABLE_WHILE_OUT_OF_SYNC.extend(["validate_geant_ip_prefix_list"])
+
 #  IP trunk workflows
 LazyWorkflowInstance("gso.workflows.iptrunk.activate_iptrunk", "activate_iptrunk")
 LazyWorkflowInstance("gso.workflows.iptrunk.create_iptrunk", "create_iptrunk")