diff --git a/wolfssl/wolfcrypt/asn_public.h b/wolfssl/wolfcrypt/asn_public.h
index 9bd337eff..a3c914a58 100644
--- a/wolfssl/wolfcrypt/asn_public.h
+++ b/wolfssl/wolfcrypt/asn_public.h
@@ -100,11 +100,15 @@ enum Ctc_Encoding {
     CTC_PRINTABLE  = 0x13  /* printable */
 };
 
+#ifndef WC_CTC_MAX_ALT_SIZE
+    #define WC_CTC_MAX_ALT_SIZE 16384
+#endif
+
 enum Ctc_Misc {
     CTC_COUNTRY_SIZE  =     2,
     CTC_NAME_SIZE     =    64,
     CTC_DATE_SIZE     =    32,
-    CTC_MAX_ALT_SIZE  = 16384,   /* may be huge */
+    CTC_MAX_ALT_SIZE  = WC_CTC_MAX_ALT_SIZE, /* may be huge, default: 16384 */
     CTC_SERIAL_SIZE   =    16,
 #ifdef WOLFSSL_CERT_EXT
     /* AKID could contains: hash + (Option) AuthCertIssuer,AuthCertSerialNum