diff --git a/server/text_generation_server/utils/tokens.py b/server/text_generation_server/utils/tokens.py
index 1556376..c759464 100644
--- a/server/text_generation_server/utils/tokens.py
+++ b/server/text_generation_server/utils/tokens.py
@@ -75,7 +75,11 @@ class NextTokenChooser:
 
     def __call__(self, input_ids, scores):
         # Warp logits
-        scores = self.warpers(input_ids, scores)
+        if scores.shape[0] > 1:
+            # only warp the last token logits
+            scores[-1:, :] = self.warpers(input_ids, scores[-1:, :])
+        else:
+            scores = self.warpers(input_ids, scores)
 
         # Compute logprobs
         logprobs = torch.log_softmax(scores, -1)