diff --git a/adafruit_sgp40.py b/adafruit_sgp40.py
index a9ecf10..65ab39c 100644
--- a/adafruit_sgp40.py
+++ b/adafruit_sgp40.py
@@ -37,17 +37,10 @@
 __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_SGP40.git"
 
 _WORD_LEN = 2
+
 # no point in generating this each time
-_READ_CMD = [
-    0x26,
-    0x0F,
-    0x80,
-    0x00,
-    0xA2,
-    0x66,
-    0x66,
-    0x93,
-]  # Generated from temp 25c, humidity 50%
+# Generated from temp 25c, humidity 50%
+_READ_CMD = b"\x26\x0F\x80\x00\xA2\x66\x66\x93"
 
 
 class SGP40: