diff --git a/crypto/asn1/a_strex.c b/crypto/asn1/a_strex.c
index 59d51210c3cd59349b107ef5a5b2c22d85524044..d419e9d2ce4900b7fae9be4d54b0ef5c9c48936f 100644
--- a/crypto/asn1/a_strex.c
+++ b/crypto/asn1/a_strex.c
@@ -282,7 +282,7 @@ static const signed char tag2nbyte[] = {
     -1, -1, -1, -1, -1,         /* 5-9 */
     -1, -1, 0, -1,              /* 10-13 */
     -1, -1, -1, -1,             /* 15-17 */
-    -1, 1, 1,                   /* 18-20 */
+    1, 1, 1,                    /* 18-20 */
     -1, 1, 1, 1,                /* 21-24 */
     -1, 1, -1,                  /* 25-27 */
     4, -1, 2                    /* 28-30 */