diff --git a/src/crypto/x509v3/ext_dat.h b/src/crypto/x509v3/ext_dat.h
index 8b2c123..f1fb8ef 100644
--- a/src/crypto/x509v3/ext_dat.h
+++ b/src/crypto/x509v3/ext_dat.h
@@ -55,17 +55,17 @@
 
 /* This file contains a table of "standard" extensions */
 
-extern X509V3_EXT_METHOD v3_bcons, v3_nscert, v3_key_usage, v3_ext_ku;
-extern X509V3_EXT_METHOD v3_pkey_usage_period, v3_sxnet, v3_info, v3_sinfo;
-extern X509V3_EXT_METHOD v3_ns_ia5_list[], v3_alt[], v3_skey_id, v3_akey_id;
-extern X509V3_EXT_METHOD v3_crl_num, v3_crl_reason, v3_crl_invdate;
-extern X509V3_EXT_METHOD v3_delta_crl, v3_cpols, v3_crld, v3_freshest_crl;
-extern X509V3_EXT_METHOD v3_ocsp_nonce, v3_ocsp_accresp, v3_ocsp_acutoff;
-extern X509V3_EXT_METHOD v3_ocsp_crlid, v3_ocsp_nocheck, v3_ocsp_serviceloc;
-extern X509V3_EXT_METHOD v3_crl_hold, v3_pci;
-extern X509V3_EXT_METHOD v3_policy_mappings, v3_policy_constraints;
-extern X509V3_EXT_METHOD v3_name_constraints, v3_inhibit_anyp, v3_idp;
-extern X509V3_EXT_METHOD v3_addr, v3_asid;
+extern const X509V3_EXT_METHOD v3_bcons, v3_nscert, v3_key_usage, v3_ext_ku;
+extern const X509V3_EXT_METHOD v3_pkey_usage_period, v3_sxnet, v3_info, v3_sinfo;
+extern const X509V3_EXT_METHOD v3_ns_ia5_list[], v3_alt[], v3_skey_id, v3_akey_id;
+extern const X509V3_EXT_METHOD v3_crl_num, v3_crl_reason, v3_crl_invdate;
+extern const X509V3_EXT_METHOD v3_delta_crl, v3_cpols, v3_crld, v3_freshest_crl;
+extern const X509V3_EXT_METHOD v3_ocsp_nonce, v3_ocsp_accresp, v3_ocsp_acutoff;
+extern const X509V3_EXT_METHOD v3_ocsp_crlid, v3_ocsp_nocheck, v3_ocsp_serviceloc;
+extern const X509V3_EXT_METHOD v3_crl_hold, v3_pci;
+extern const X509V3_EXT_METHOD v3_policy_mappings, v3_policy_constraints;
+extern const X509V3_EXT_METHOD v3_name_constraints, v3_inhibit_anyp, v3_idp;
+extern const X509V3_EXT_METHOD v3_addr, v3_asid;
 
 /* This table will be searched using OBJ_bsearch so it *must* kept in
  * order of the ext_nid values.