diff --git a/server/text_generation_server/utils/logits_process.py b/server/text_generation_server/utils/logits_process.py
index b9a4b691..291c522f 100644
--- a/server/text_generation_server/utils/logits_process.py
+++ b/server/text_generation_server/utils/logits_process.py
@@ -136,10 +136,10 @@ class FrequencyPenaltyLogitsProcessor(LogitsProcessor):
         score = torch.gather(scores, 1, input_ids)
         # if score < 0 then penalty has to be multiplied to reduce the previous token probability
         score = -torch.where(
-            score < 0, score * self.penalty_tensor, score / self.penalty_tensor
+            score < 0, score * self.penalty, score / self.penalty
         )
 
-        return scores - torch.scatter(scores, 1, input_ids, score)
+        return scores.scatter_add_(1, input_ids, score)
 
 
 class HeterogeneousFrequencyPenaltyLogitsProcessor(LogitsProcessor):