diff --git a/adafruit_fram.py b/adafruit_fram.py
index f76712a..41735bd 100755
--- a/adafruit_fram.py
+++ b/adafruit_fram.py
@@ -169,9 +169,9 @@ def __setitem__(self, address, value):
             raise RuntimeError("FRAM currently write protected.")
 
         if isinstance(address, int):
-            if not isinstance(value, (int, bytearray, list, tuple)):
+            if not isinstance(value, (int, bytes, bytearray, list, tuple)):
                 raise ValueError(
-                    "Data must be a single integer, or a bytearray," " list, or tuple."
+                    "Data must be a single integer, bytes, bytearray, list, or tuple."
                 )
             if not 0 <= address < self._max_size:
                 raise ValueError(