diff --git a/litellm/proxy/hooks/parallel_request_limiter_v3.py b/litellm/proxy/hooks/parallel_request_limiter_v3.py
index c462493de6c..2bdfb84609f 100644
--- a/litellm/proxy/hooks/parallel_request_limiter_v3.py
+++ b/litellm/proxy/hooks/parallel_request_limiter_v3.py
@@ -65,6 +65,13 @@ for i = 1, #KEYS, 2 do
         table.insert(results, increment_value) -- counter
     else
         local counter = redis.call('INCR', counter_key)
+        -- FIX: Set TTL if counter key was just created (has no TTL)
+        -- This happens when window_key exists but counter_key doesn't (e.g., tokens key
+        -- created after requests key when both share the same window_key)
+        local current_ttl = redis.call('TTL', counter_key)
+        if current_ttl == -1 then
+            redis.call('EXPIRE', counter_key, window_size)
+        end
         table.insert(results, window_start) -- window_start
         table.insert(results, counter) -- counter
     end