diff --git a/ext/openssl/ossl_ts.c b/ext/openssl/ossl_ts.c
index 615eedc016..b31a854a63 100644
--- a/ext/openssl/ossl_ts.c
+++ b/ext/openssl/ossl_ts.c
@@ -259,7 +259,7 @@ ossl_ts_req_get_msg_imprint(VALUE self)
     mi = TS_REQ_get_msg_imprint(req);
     hashed_msg = TS_MSG_IMPRINT_get_msg(mi);
 
-    ret = rb_str_new((const char *)hashed_msg->data, hashed_msg->length);
+    ret = asn1str_to_str(hashed_msg);
 
     return ret;
 }
@@ -470,7 +470,7 @@ ossl_ts_req_to_der(VALUE self)
         ossl_raise(eTimestampError, "Message imprint missing algorithm");
 
     hashed_msg = TS_MSG_IMPRINT_get_msg(mi);
-    if (!hashed_msg->length)
+    if (!ASN1_STRING_length(hashed_msg))
         ossl_raise(eTimestampError, "Message imprint missing hashed message");
 
     return asn1_to_der((void *)req, (int (*)(void *, unsigned char **))i2d_TS_REQ);
@@ -981,7 +981,7 @@ ossl_ts_token_info_get_msg_imprint(VALUE self)
     GetTSTokenInfo(self, info);
     mi = TS_TST_INFO_get_msg_imprint(info);
     hashed_msg = TS_MSG_IMPRINT_get_msg(mi);
-    ret = rb_str_new((const char *)hashed_msg->data, hashed_msg->length);
+    ret = asn1str_to_str(hashed_msg);
 
     return ret;
 }