--- a/lib/int.h	2022-11-30 14:21:26.985600761 -0500
+++ b/lib/int.h	2022-11-30 14:23:25.856065950 -0500
@@ -97,7 +97,7 @@
 #define ETYPE_TAG(etype) (_asn1_tags[etype].tag)
 #define ETYPE_CLASS(etype) (_asn1_tags[etype].class)
 #define ETYPE_OK(etype) (((etype) != ASN1_ETYPE_INVALID && \
-                          (etype) <= _asn1_tags_size && \
+                          (etype) < _asn1_tags_size && \
                           _asn1_tags[(etype)].desc != NULL)?1:0)
 
 #define ETYPE_IS_STRING(etype) ((etype == ASN1_ETYPE_GENERALSTRING || \