diff --git a/src/lightning/fabric/plugins/precision/amp.py b/src/lightning/fabric/plugins/precision/amp.py
index 36326bfaa001f..b3044dac26aff 100644
--- a/src/lightning/fabric/plugins/precision/amp.py
+++ b/src/lightning/fabric/plugins/precision/amp.py
@@ -42,7 +42,9 @@ def __init__(
         scaler: Optional[torch.cuda.amp.GradScaler] = None,
     ) -> None:
         if precision not in ("16-mixed", "bf16-mixed"):
-            raise ValueError(f"Passed `{type(self).__name__}(precision={precision!r})`. Precision must be '16-mixed' or 'bf16-mixed'")
+            raise ValueError(
+                f"Passed `{type(self).__name__}(precision={precision!r})`. Precision must be '16-mixed' or 'bf16-mixed'"
+            )
 
         self.precision = cast(Literal["16-mixed", "bf16-mixed"], str(precision))
         if scaler is None and self.precision == "16-mixed":
diff --git a/src/lightning/pytorch/plugins/precision/amp.py b/src/lightning/pytorch/plugins/precision/amp.py
index 119502fbcd75b..9a96a45f8315f 100644
--- a/src/lightning/pytorch/plugins/precision/amp.py
+++ b/src/lightning/pytorch/plugins/precision/amp.py
@@ -41,7 +41,9 @@ def __init__(
         scaler: Optional[torch.cuda.amp.GradScaler] = None,
     ) -> None:
         if precision not in ("16-mixed", "bf16-mixed"):
-            raise ValueError(f"`Passed `{type(self).__name__}(precision={precision!r})`. Precision must be '16-mixed' or 'bf16-mixed'")
+            raise ValueError(
+                f"`Passed `{type(self).__name__}(precision={precision!r})`. Precision must be '16-mixed' or 'bf16-mixed'"
+            )
 
         self.precision = cast(Literal["16-mixed", "bf16-mixed"], str(precision))
         if scaler is None and self.precision == "16-mixed":