diff --git a/adafruit_seesaw/seesaw.py b/adafruit_seesaw/seesaw.py
index 67e1d75..5a96218 100644
--- a/adafruit_seesaw/seesaw.py
+++ b/adafruit_seesaw/seesaw.py
@@ -159,7 +159,7 @@ def __init__(self, i2c_bus, addr=0x49, drdy=None, reset=True):
             _SAMD09_HW_ID_CODE,
         ):
             raise RuntimeError(
-                f"Seesaw hardware ID returned 0x{self.chip_id} is not "
+                f"Seesaw hardware ID returned 0x{self.chip_id:x} is not "
                 "correct! Please check your wiring."
             )