diff --git a/crypto/x509/x509_set.c b/crypto/x509/x509_set.c
index 6141af0d9..5f1785198 100644
--- a/crypto/x509/x509_set.c
+++ b/crypto/x509/x509_set.c
@@ -125,9 +125,9 @@ int X509_set1_notBefore(X509 *x, const ASN1_TIME *tm)
         return (0);
     in = x->cert_info->validity->notBefore;
     if (in != tm) {
-        in = M_ASN1_TIME_dup(tm);
+        in = ASN1_STRING_dup(tm);
         if (in != NULL) {
-            M_ASN1_TIME_free(x->cert_info->validity->notBefore);
+            ASN1_TIME_free(x->cert_info->validity->notBefore);
             x->cert_info->validity->notBefore = in;
         }
     }
@@ -168,9 +168,9 @@ int X509_set1_notAfter(X509 *x, const ASN1_TIME *tm)
         return (0);
     in = x->cert_info->validity->notAfter;
     if (in != tm) {
-        in = M_ASN1_TIME_dup(tm);
+        in = ASN1_STRING_dup(tm);
         if (in != NULL) {
-            M_ASN1_TIME_free(x->cert_info->validity->notAfter);
+            ASN1_TIME_free(x->cert_info->validity->notAfter);
             x->cert_info->validity->notAfter = in;
         }
     }
diff --git a/crypto/x509/x509cset.c b/crypto/x509/x509cset.c
index 04f1f87eb..f207a25c6 100644
--- a/crypto/x509/x509cset.c
+++ b/crypto/x509/x509cset.c
@@ -87,9 +87,9 @@ int X509_CRL_set1_lastUpdate(X509_CRL *x, const ASN1_TIME *tm)
         return (0);
     in = x->crl->lastUpdate;
     if (in != tm) {
-        in = M_ASN1_TIME_dup(tm);
+        in = ASN1_STRING_dup(tm);
         if (in != NULL) {
-            M_ASN1_TIME_free(x->crl->lastUpdate);
+            ASN1_TIME_free(x->crl->lastUpdate);
             x->crl->lastUpdate = in;
         }
     }
@@ -104,9 +104,9 @@ int X509_CRL_set1_nextUpdate(X509_CRL *x, const ASN1_TIME *tm)
         return (0);
     in = x->crl->nextUpdate;
     if (in != tm) {
-        in = M_ASN1_TIME_dup(tm);
+        in = ASN1_STRING_dup(tm);
         if (in != NULL) {
-            M_ASN1_TIME_free(x->crl->nextUpdate);
+            ASN1_TIME_free(x->crl->nextUpdate);
             x->crl->nextUpdate = in;
         }
     }
@@ -202,9 +202,9 @@ int X509_REVOKED_set_revocationDate(X509_REVOKED *x, ASN1_TIME *tm)
         return (0);
     in = x->revocationDate;
     if (in != tm) {
-        in = M_ASN1_TIME_dup(tm);
+        in = ASN1_STRING_dup(tm);
         if (in != NULL) {
-            M_ASN1_TIME_free(x->revocationDate);
+            ASN1_TIME_free(x->revocationDate);
             x->revocationDate = in;
         }
     }