diff --git a/src/lj_def.h b/src/lj_def.h
index 3c43be7..e88415b 100644
--- a/src/lj_def.h
+++ b/src/lj_def.h
@@ -72,7 +72,9 @@ typedef unsigned int uintptr_t;
 /* Minimum table/buffer sizes. */
 #define LJ_MIN_GLOBAL	6		/* Min. global table size (hbits). */
 #define LJ_MIN_REGISTRY	2		/* Min. registry size (hbits). */
+#ifndef LJ_MIN_STRTAB
 #define LJ_MIN_STRTAB	256		/* Min. string table size (pow2). */
+#endif
 #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. */