diff --git a/adafruit_si1145.py b/adafruit_si1145.py
index 4c6a999..b465bbe 100644
--- a/adafruit_si1145.py
+++ b/adafruit_si1145.py
@@ -162,7 +162,7 @@ def _send_command(self, command):
         response = self._read_register(_RESPONSE)
         while counter == response & 0x0F:
             if response & 0xF0:
-                raise RuntimeError("SI1145 Error: 0x{:02x}".format(response & 0xF0))
+                raise RuntimeError("SI1145 Error: 0x{:02x}".format(response))
             response = self._read_register(_RESPONSE)
         return response