diff --git a/src/lj_def.h b/src/lj_def.h
index 64094a06f8..af1e879a72 100644
--- a/src/lj_def.h
+++ b/src/lj_def.h
@@ -49,7 +49,6 @@
 #define LJ_MIN_SBUF	32		/* Min. string buffer length. */
 #define LJ_MIN_VECSZ	8		/* Min. size for growable vectors. */
 #define LJ_MIN_IRSZ	32		/* Min. size for growable IR. */
-#define LJ_MIN_K64SZ	16		/* Min. size for chained K64Array. */
 
 /* JIT compiler limits. */
 #define LJ_MAX_JSLOTS	250		/* Max. # of stack slots for a trace. */