diff --git a/inkyshot/update-display.py b/inkyshot/update-display.py
index 73d0f2c..519dc46 100644
--- a/inkyshot/update-display.py
+++ b/inkyshot/update-display.py
@@ -283,8 +283,8 @@ def temp_to_str(temp, scale):
     # These are the opposite of what InkyPhat uses.
     WIDTH = display.height # yes, Height
     HEIGHT = display.width # yes, width
-    BLACK = "black"
-    WHITE = "white"
+    BLACK = 0
+    WHITE = 1
     img = Image.new('1', (WIDTH, HEIGHT), 255)
 else:
     import inky