diff --git a/src/main/java/org/zalando/nakadi/service/subscription/zk/AbstractZkSubscriptionClient.java b/src/main/java/org/zalando/nakadi/service/subscription/zk/AbstractZkSubscriptionClient.java
index 6d79fbd9e5..7c72297a6e 100644
--- a/src/main/java/org/zalando/nakadi/service/subscription/zk/AbstractZkSubscriptionClient.java
+++ b/src/main/java/org/zalando/nakadi/service/subscription/zk/AbstractZkSubscriptionClient.java
@@ -238,32 +238,22 @@ protected <K, V> Map<K, V> loadDataAsync(final Collection<K> keys,
     public final Collection<Session> listSessions()
             throws SubscriptionNotInitializedException, NakadiRuntimeException, ServiceTemporarilyUnavailableException {
         getLog().info("fetching sessions information");
-        final int numberOfCalls = 3;
-        for (int i = 0; i < numberOfCalls; i++) {
-            final List<String> zkSessions;
-            final Map <String,Session> result;
+        for (int i = 0; i < 5; i++) {
             try {
-                zkSessions = getCurator().getChildren().forPath(getSubscriptionPath("/sessions"));
+                final List<String> sessions = getCurator().getChildren().forPath(getSubscriptionPath("/sessions"));
+                final Map <String,Session> result = loadDataAsync(sessions,
+                        key -> getSubscriptionPath("/sessions/" + key),
+                        this::deserializeSession);
+                if (result.size() == sessions.size()) {
+                    return result.values();
+                }
             } catch (final KeeperException.NoNodeException e) {
                 throw new SubscriptionNotInitializedException(getSubscriptionId());
             } catch (Exception ex) {
                 throw new NakadiRuntimeException(ex);
             }
-            result = loadDataAsync(zkSessions, key -> getSubscriptionPath("/sessions/" + key),
-                    this::deserializeSession);
-            if (result.size() == zkSessions.size()) {
-                return result.values();
-            }
-            if (i == numberOfCalls-1) {
-                throw new ServiceTemporarilyUnavailableException("Failed to get all keys " +
-                        zkSessions.stream()
-                                .filter(v -> !result.containsKey(v))
-                                .map(String::valueOf)
-                                .collect(Collectors.joining(", "))
-                        + " from ZK", null);
-            }
         }
-        return null;
+        throw new ServiceTemporarilyUnavailableException("Failed to get all keys from ZK", null);
     }
 
     @Override