diff --git a/decrepit/CMakeLists.txt b/decrepit/CMakeLists.txt
index d158def..6f83bdc 100644
--- a/decrepit/CMakeLists.txt
+++ b/decrepit/CMakeLists.txt
@@ -5,6 +5,7 @@
 add_subdirectory(dsa)
 add_subdirectory(evp)
 add_subdirectory(rsa)
+add_subdirectory(x509)
 add_subdirectory(xts)
 
 add_library(
@@ -17,6 +18,7 @@
   $<TARGET_OBJECTS:dsa_decrepit>
   $<TARGET_OBJECTS:evp_decrepit>
   $<TARGET_OBJECTS:rsa_decrepit>
+  $<TARGET_OBJECTS:x509>
   $<TARGET_OBJECTS:xts>
 )
 
diff --git a/decrepit/x509/CMakeLists.txt b/decrepit/x509/CMakeLists.txt
new file mode 100644
index 0000000..930912d
--- /dev/null
+++ b/decrepit/x509/CMakeLists.txt
@@ -0,0 +1,9 @@
+include_directories(../../include)
+
+add_library(
+  x509_decrepit
+
+  OBJECT
+
+  x509_decrepit.c
+)
diff --git a/decrepit/x509/x509_decrepit.c b/decrepit/x509/x509_decrepit.c
new file mode 100644
index 0000000..5714b40
--- /dev/null
+++ b/decrepit/x509/x509_decrepit.c
@@ -0,0 +1,42 @@
+/* Copyright (c) 2016, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#include <openssl/conf.h>
+#include <openssl/x509v3.h>
+
+
+X509_EXTENSION *X509V3_EXT_conf_nid(LHASH_OF(CONF_VALUE) *conf,
+                                    X509V3_CTX *ctx, int ext_nid, char *value) {
+  CONF *nconf = NULL;
+  LHASH_OF(CONF_VALUE) *orig_data = NULL;
+
+  if (conf != NULL) {
+    nconf = NCONF_new(NULL /* no method */);
+    if (nconf == NULL) {
+      return NULL;
+    }
+
+    orig_data = nconf->data;
+    nconf->data = conf;
+  }
+
+  X509_EXTENSION *ret = X509V3_EXT_nconf_nid(nconf, ctx, ext_nid, value);
+
+  if (nconf != NULL) {
+    nconf->data = orig_data;
+    NCONF_free(nconf);
+  }
+
+  return ret;
+}
diff --git a/include/openssl/x509v3.h b/include/openssl/x509v3.h
index b7b8ba7..a3d5a4b 100644
--- a/include/openssl/x509v3.h
+++ b/include/openssl/x509v3.h
@@ -600,6 +600,7 @@
 				  X509V3_CTX *ctx, CONF_VALUE *cnf, int is_nc);
 OPENSSL_EXPORT void X509V3_conf_free(CONF_VALUE *val);
 
+OPENSSL_EXPORT X509_EXTENSION *X509V3_EXT_conf_nid(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, int ext_nid, char *value);
 OPENSSL_EXPORT X509_EXTENSION *X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid, char *value);
 OPENSSL_EXPORT X509_EXTENSION *X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, char *name, char *value);
 OPENSSL_EXPORT int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, char *section, STACK_OF(X509_EXTENSION) **sk);