diff --git a/luma/led_matrix/device.py b/luma/led_matrix/device.py
index 7131d5e..0bf4289 100644
--- a/luma/led_matrix/device.py
+++ b/luma/led_matrix/device.py
@@ -423,7 +423,7 @@ def display(self, image):
 
         # Send 32 zero-bits to reset, then pixel values then n/2 zero-bits at end
         sz = image.width * image.height * 4
-        buf = bytearray(4 + sz + ceil(image.width * image.height/8/2))
+        buf = bytearray(4 + sz + ceil(image.width * image.height / 8 / 2))
 
         m = self._mapping
         for idx, (r, g, b, a) in enumerate(image.getdata()):