diff --git a/lib/sidetiq/lock/meta_data.rb b/lib/sidetiq/lock/meta_data.rb
index e5cd030..a22042f 100644
--- a/lib/sidetiq/lock/meta_data.rb
+++ b/lib/sidetiq/lock/meta_data.rb
@@ -44,13 +44,6 @@ module Sidetiq
         end.to_json
       end
 
-      def stale?
-        pttl_cached = pttl
-
-        pttl_cached < 0 || pttl_cached >= Sidetiq.config.lock_expire ||
-          timestamp < (Sidetiq.clock.gettime.to_i - 60)
-      end
-
       def to_s
         "Sidetiq::Lock on #{key} set at #{timestamp} by #{owner}"
       end
diff --git a/lib/sidetiq/lock/redis.rb b/lib/sidetiq/lock/redis.rb
index d9fe538..d86a1b3 100644
--- a/lib/sidetiq/lock/redis.rb
+++ b/lib/sidetiq/lock/redis.rb
@@ -35,6 +35,16 @@ module Sidetiq
         end
       end
 
+      def stale?
+        pttl = meta_data.pttl
+
+        # Consider PTTL of -1 (never set) and larger than the
+        # configured lock_expire as invalid. Locks with timestamps
+        # older than 1 minute are also considered stale.
+        pttl < 0 || pttl >= Sidetiq.config.lock_expire ||
+          meta_data.timestamp < (Sidetiq.clock.gettime.to_i - 60)
+      end
+
       def meta_data
         @meta_data ||= Sidekiq.redis do |redis|
           MetaData.from_json(redis.get(key))
diff --git a/lib/sidetiq/views/sidetiq_locks.erb b/lib/sidetiq/views/sidetiq_locks.erb
index ef3e184..3c9e8e7 100644
--- a/lib/sidetiq/views/sidetiq_locks.erb
+++ b/lib/sidetiq/views/sidetiq_locks.erb
@@ -24,7 +24,7 @@
         <% @locks.each do |meta| %>
         <% pttl = meta.pttl %>
 
-        <tr class="<%= 'error' if meta.stale? %>">
+        <tr>
           <td><%= meta.key %></td>
           <td><%= meta.owner %></td>
           <td><%= meta.timestamp.to_i %></td>