diff --git a/tools/cert_create/src/ext.c b/tools/cert_create/src/ext.c
index 65dd3e5..2882123 100644
--- a/tools/cert_create/src/ext.c
+++ b/tools/cert_create/src/ext.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2021, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -13,8 +13,12 @@
 #include <openssl/x509v3.h>
 
 #include "cmd_opt.h"
+#include "debug.h"
 #include "ext.h"
 
+ext_t *extensions;
+unsigned int num_extensions;
+
 DECLARE_ASN1_ITEM(ASN1_INTEGER)
 DECLARE_ASN1_ITEM(X509_ALGOR)
 DECLARE_ASN1_ITEM(ASN1_OCTET_STRING)
@@ -51,6 +55,26 @@
 	int nid, ret;
 	unsigned int i;
 
+	extensions = malloc((num_def_extensions * sizeof(def_extensions[0]))
+#ifdef PDEF_EXTS
+			    + (num_pdef_extensions * sizeof(pdef_extensions[0]))
+#endif
+			    );
+	if (extensions == NULL) {
+		ERROR("%s:%d Failed to allocate memory.\n", __func__, __LINE__);
+		return 1;
+	}
+
+	memcpy(&extensions[0], &def_extensions[0],
+	       (num_def_extensions * sizeof(def_extensions[0])));
+#ifdef PDEF_EXTS
+	memcpy(&extensions[num_def_extensions], &pdef_extensions[0],
+		(num_pdef_extensions * sizeof(pdef_extensions[0])));
+	num_extensions = num_def_extensions + num_pdef_extensions;
+#else
+	num_extensions = num_def_extensions;
+#endif
+
 	for (i = 0; i < num_extensions; i++) {
 		ext = &extensions[i];
 		/* Register command line option */