diff --git a/horrlang.py b/horrlang.py
index 6242455..b8050c2 100755
--- a/horrlang.py
+++ b/horrlang.py
@@ -41,8 +41,8 @@ class Machine:
 
     def get_integer(self):
         parameter = 0
-        while chr(self.mem[self.exc_ptr + 1]) >= '0' \
-                and chr(self.mem[self.exc_ptr + 1]) <= '9':
+        while self.mem[self.exc_ptr + 1] >= 0x30 \
+                and self.mem[self.exc_ptr + 1] <= 0x39:
             self.exc_ptr += 1
             if not self.cycle():
                 return parameter