diff --git a/rewritegcode.py b/rewritegcode.py
index bbc8616..daed7eb 100644
--- a/rewritegcode.py
+++ b/rewritegcode.py
@@ -3,7 +3,7 @@ import sys
 
 XADD = 150
 YADD = 300
-ZDOWN 62.4
+ZDOWN = 62.4
 ZUP = ZDOWN + 5
 
 def get_xy(line):