diff --git a/requires.py b/requires.py
index ce0bf7a..a0a67b1 100644
--- a/requires.py
+++ b/requires.py
@@ -18,6 +18,7 @@ from charms.reactive import hook
 from charms.reactive import RelationBase
 from charms.reactive import scopes
 from charms.reactive.helpers import data_changed
+from charmhelpers.core import hookenv
 
 
 class HAClusterRequires(RelationBase):
@@ -32,13 +33,38 @@ class HAClusterRequires(RelationBase):
 
     @hook('{requires:hacluster}-relation-changed')
     def changed(self):
-        self.set_state('{relation_name}.available')
+        if self.is_clustered():
+            self.set_state('{relation_name}.available')
+        else:
+            self.remove_state('{relation_name}.available')
 
     @hook('{requires:hacluster}-relation-{broken,departed}')
     def departed(self):
         self.remove_state('{relation_name}.available')
         self.remove_state('{relation_name}.connected')
 
+    def is_clustered(self):
+        """Has the hacluster charm set clustered?
+
+        The hacluster charm sets cluster=True when it determines it is ready.
+        Check the relation data for clustered and force a boolean return.
+
+        :returns: boolean
+        """
+        clustered_values = self.get_remote_all('clustered')
+        if clustered_values:
+            # There is only ever one subordinate hacluster unit
+            clustered = clustered_values[0]
+            # Future versions of hacluster will return a bool
+            # Current versions return a string
+            if type(clustered) is bool:
+                return clustered
+            elif (clustered is not None and
+                    (clustered.lower() == 'true' or
+                     clustered.lower() == 'yes')):
+                return True
+        return False
+
     def bind_on(self, iface=None, mcastport=None):
         relation_data = {}
         if iface:
@@ -167,3 +193,16 @@ class HAClusterRequires(RelationBase):
                 resources.group(group, *dns_res_group_members)
 
         self.set_local(resources=resources)
+
+    def get_remote_all(self, key, default=None):
+        """Return a list of all values presented by remote units for key"""
+        values = []
+        for conversation in self.conversations():
+            for relation_id in conversation.relation_ids:
+                for unit in hookenv.related_units(relation_id):
+                    value = hookenv.relation_get(key,
+                                                 unit,
+                                                 relation_id) or default
+                    if value:
+                        values.append(value)
+        return list(set(values))