diff --git a/lib/asn1/asn1_print.c b/lib/asn1/asn1_print.c
index 7f1599bcc..693343840 100644
--- a/lib/asn1/asn1_print.c
+++ b/lib/asn1/asn1_print.c
@@ -434,7 +434,7 @@ dotype(unsigned char *buf, size_t len, char **argv, size_t *size)
 
                 if (wants != sz)
                     errx(1, "Encoding will not round trip");
-                ret = sorted_types[i].encode(der, sz, v, &sz);
+                ret = sorted_types[i].encode(der + (sz - 1), sz, v, &sz);
                 if (ret != 0)
                     errx(1, "Encoding failed");
                 if (memcmp(buf, der, sz))
@@ -452,7 +452,7 @@ dotype(unsigned char *buf, size_t len, char **argv, size_t *size)
 
                     if (wants != sz)
                         errx(1, "Encoding of copy will not round trip");
-                    ret = sorted_types[i].encode(der, sz, vcpy, &sz);
+                    ret = sorted_types[i].encode(der + (sz - 1), sz, vcpy, &sz);
                     if (ret != 0)
                         errx(1, "Encoding of copy failed");
                     if (memcmp(buf, der, sz))