diff --git a/optimum/exporters/openvino/model_patcher.py b/optimum/exporters/openvino/model_patcher.py
index 629f47aa72..26f3b42d52 100644
--- a/optimum/exporters/openvino/model_patcher.py
+++ b/optimum/exporters/openvino/model_patcher.py
@@ -382,9 +382,9 @@ def _llama_gemma_update_causal_mask_legacy(self, attention_mask, input_tensor, c
                 offset = 0
             mask_shape = attention_mask.shape
             mask_slice = (attention_mask.eq(0.0)).to(dtype=dtype) * min_dtype
-            causal_mask[: mask_shape[0], : mask_shape[1], offset : mask_shape[2] + offset, : mask_shape[3]] = (
-                mask_slice
-            )
+            causal_mask[
+                : mask_shape[0], : mask_shape[1], offset : mask_shape[2] + offset, : mask_shape[3]
+            ] = mask_slice
 
     if (
         self.config._attn_implementation == "sdpa"