diff --git a/helios-services/src/main/java/com/spotify/helios/master/ZooKeeperMasterModel.java b/helios-services/src/main/java/com/spotify/helios/master/ZooKeeperMasterModel.java
index 15cd2729f..cbf61c4da 100644
--- a/helios-services/src/main/java/com/spotify/helios/master/ZooKeeperMasterModel.java
+++ b/helios-services/src/main/java/com/spotify/helios/master/ZooKeeperMasterModel.java
@@ -972,14 +972,14 @@ private boolean isRolloutTimedOut(final ZooKeeperClient client,
     } catch (KeeperException e) {
       // statusPath doesn't exist or some other ZK issue. probably this deployment group
       // was removed.
-      log.warn("error determining deployment group modification time: {}", groupName, e);
+      log.warn("error determining deployment group modification time: name={}", groupName, e);
       return false;
     }
 
     if (secondsSinceDeploy > groupTimeoutSetting) {
       log.info("rolling-update on deployment-group name={} has timed out after "
                + "{} seconds (rolloutOptions.timeout={})",
-          secondsSinceDeploy, groupTimeoutSetting);
+          groupName, secondsSinceDeploy, groupTimeoutSetting);
       return true;
     }
     return false;