diff --git a/tensorflow/python/framework/tensor_util.py b/tensorflow/python/framework/tensor_util.py
index 26d82b9a726433865e5b23bb9efcce368a2f5b26..b494f52410ee2a8ba5b54a3662b634db64d32cc9 100644
--- a/tensorflow/python/framework/tensor_util.py
+++ b/tensorflow/python/framework/tensor_util.py
@@ -73,14 +73,11 @@ def FastAppendBFloat16ArrayToTensorProto(tensor_proto, proto_values):
           proto_values, dtype=dtypes.bfloat16.as_numpy_dtype).view(np.uint16))
 
 
-def ExtractBitsFromFloat8e5m2(x):
-  return np.asarray(
-      x, dtype=dtypes.float8_e5m2.as_numpy_dtype).view(np.uint8).item()
-
-
 def SlowAppendFloat8e5m2ArrayToTensorProto(tensor_proto, proto_values):
-  tensor_proto.float8_val.extend(
-      [ExtractBitsFromFloat8e5m2(x) for x in proto_values]
+  tensor_proto.float8_val += (
+      np.asarray(proto_values, dtype=dtypes.float8_e5m2.as_numpy_dtype)
+      .view(np.uint8)
+      .tobytes()
   )
 
 
@@ -91,14 +88,11 @@ def FastAppendFloat8e5m2ArrayToTensorProto(tensor_proto, proto_values):
                  dtype=dtypes.float8_e5m2.as_numpy_dtype).view(np.uint8))
 
 
-def ExtractBitsFromFloat8e4m3fn(x):
-  return np.asarray(
-      x, dtype=dtypes.float8_e4m3fn.as_numpy_dtype).view(np.uint8).item()
-
-
 def SlowAppendFloat8e4m3fnArrayToTensorProto(tensor_proto, proto_values):
-  tensor_proto.float8_val.extend(
-      [ExtractBitsFromFloat8e4m3fn(x) for x in proto_values]
+  tensor_proto.float8_val += (
+      np.asarray(proto_values, dtype=dtypes.float8_e4m3fn.as_numpy_dtype)
+      .view(np.uint8)
+      .tobytes()
   )