diff --git a/Python/pyarena.c b/Python/pyarena.c
index c5491e954a8..24a73743009 100644
--- a/Python/pyarena.c
+++ b/Python/pyarena.c
@@ -13,7 +13,6 @@
 
 #define DEFAULT_BLOCK_SIZE 8192
 #define ALIGNMENT		8
-#define ALIGNMENT_SHIFT		3
 #define ALIGNMENT_MASK		(ALIGNMENT - 1)
 #define ROUNDUP(x)		(((x) + ALIGNMENT_MASK) & ~ALIGNMENT_MASK)