diff --git a/include/openssl/stack_macros.h b/include/openssl/stack_macros.h
index a4dc926..08097af 100644
--- a/include/openssl/stack_macros.h
+++ b/include/openssl/stack_macros.h
@@ -2106,6 +2106,99 @@
       CHECKED_CAST(void *(*)(void *), SSL_COMP *(*)(SSL_COMP *), copy_func), \
       CHECKED_CAST(void (*)(void *), void (*)(SSL_COMP *), free_func)))
 
+/* SSL_CUSTOM_EXTENSION */
+#define sk_SSL_CUSTOM_EXTENSION_new(comp)                                      \
+  ((STACK_OF(SSL_CUSTOM_EXTENSION) *)sk_new(CHECKED_CAST(                      \
+      stack_cmp_func,                                                          \
+      int (*)(const SSL_CUSTOM_EXTENSION **a, const SSL_CUSTOM_EXTENSION **b), \
+      comp)))
+
+#define sk_SSL_CUSTOM_EXTENSION_new_null() \
+  ((STACK_OF(SSL_CUSTOM_EXTENSION) *)sk_new_null())
+
+#define sk_SSL_CUSTOM_EXTENSION_num(sk) \
+  sk_num(CHECKED_CAST(_STACK *, STACK_OF(SSL_CUSTOM_EXTENSION) *, sk))
+
+#define sk_SSL_CUSTOM_EXTENSION_zero(sk) \
+  sk_zero(CHECKED_CAST(_STACK *, STACK_OF(SSL_CUSTOM_EXTENSION) *, sk));
+
+#define sk_SSL_CUSTOM_EXTENSION_value(sk, i)                              \
+  ((SSL_CUSTOM_EXTENSION *)sk_value(                                      \
+      CHECKED_CAST(_STACK *, const STACK_OF(SSL_CUSTOM_EXTENSION) *, sk), \
+      (i)))
+
+#define sk_SSL_CUSTOM_EXTENSION_set(sk, i, p)                            \
+  ((SSL_CUSTOM_EXTENSION *)sk_set(                                       \
+      CHECKED_CAST(_STACK *, STACK_OF(SSL_CUSTOM_EXTENSION) *, sk), (i), \
+      CHECKED_CAST(void *, SSL_CUSTOM_EXTENSION *, p)))
+
+#define sk_SSL_CUSTOM_EXTENSION_free(sk) \
+  sk_free(CHECKED_CAST(_STACK *, STACK_OF(SSL_CUSTOM_EXTENSION) *, sk))
+
+#define sk_SSL_CUSTOM_EXTENSION_pop_free(sk, free_func)                        \
+  sk_pop_free(CHECKED_CAST(_STACK *, STACK_OF(SSL_CUSTOM_EXTENSION) *, sk),    \
+              CHECKED_CAST(void (*)(void *), void (*)(SSL_CUSTOM_EXTENSION *), \
+                           free_func))
+
+#define sk_SSL_CUSTOM_EXTENSION_insert(sk, p, where)                      \
+  sk_insert(CHECKED_CAST(_STACK *, STACK_OF(SSL_CUSTOM_EXTENSION) *, sk), \
+            CHECKED_CAST(void *, SSL_CUSTOM_EXTENSION *, p), (where))
+
+#define sk_SSL_CUSTOM_EXTENSION_delete(sk, where) \
+  ((SSL_CUSTOM_EXTENSION *)sk_delete(             \
+      CHECKED_CAST(_STACK *, STACK_OF(SSL_CUSTOM_EXTENSION) *, sk), (where)))
+
+#define sk_SSL_CUSTOM_EXTENSION_delete_ptr(sk, p)                   \
+  ((SSL_CUSTOM_EXTENSION *)sk_delete_ptr(                           \
+      CHECKED_CAST(_STACK *, STACK_OF(SSL_CUSTOM_EXTENSION) *, sk), \
+      CHECKED_CAST(void *, SSL_CUSTOM_EXTENSION *, p)))
+
+#define sk_SSL_CUSTOM_EXTENSION_find(sk, out_index, p)                  \
+  sk_find(CHECKED_CAST(_STACK *, STACK_OF(SSL_CUSTOM_EXTENSION) *, sk), \
+          (out_index), CHECKED_CAST(void *, SSL_CUSTOM_EXTENSION *, p))
+
+#define sk_SSL_CUSTOM_EXTENSION_shift(sk) \
+  ((SSL_CUSTOM_EXTENSION *)sk_shift(      \
+      CHECKED_CAST(_STACK *, STACK_OF(SSL_CUSTOM_EXTENSION) *, sk)))
+
+#define sk_SSL_CUSTOM_EXTENSION_push(sk, p)                             \
+  sk_push(CHECKED_CAST(_STACK *, STACK_OF(SSL_CUSTOM_EXTENSION) *, sk), \
+          CHECKED_CAST(void *, SSL_CUSTOM_EXTENSION *, p))
+
+#define sk_SSL_CUSTOM_EXTENSION_pop(sk) \
+  ((SSL_CUSTOM_EXTENSION *)sk_pop(      \
+      CHECKED_CAST(_STACK *, STACK_OF(SSL_CUSTOM_EXTENSION) *, sk)))
+
+#define sk_SSL_CUSTOM_EXTENSION_dup(sk)      \
+  ((STACK_OF(SSL_CUSTOM_EXTENSION) *)sk_dup( \
+      CHECKED_CAST(_STACK *, const STACK_OF(SSL_CUSTOM_EXTENSION) *, sk)))
+
+#define sk_SSL_CUSTOM_EXTENSION_sort(sk) \
+  sk_sort(CHECKED_CAST(_STACK *, STACK_OF(SSL_CUSTOM_EXTENSION) *, sk))
+
+#define sk_SSL_CUSTOM_EXTENSION_is_sorted(sk) \
+  sk_is_sorted(                               \
+      CHECKED_CAST(_STACK *, const STACK_OF(SSL_CUSTOM_EXTENSION) *, sk))
+
+#define sk_SSL_CUSTOM_EXTENSION_set_cmp_func(sk, comp)                       \
+  ((int (*)(const SSL_CUSTOM_EXTENSION **a, const SSL_CUSTOM_EXTENSION **b)) \
+       sk_set_cmp_func(                                                      \
+           CHECKED_CAST(_STACK *, STACK_OF(SSL_CUSTOM_EXTENSION) *, sk),     \
+           CHECKED_CAST(stack_cmp_func,                                      \
+                        int (*)(const SSL_CUSTOM_EXTENSION **a,              \
+                                const SSL_CUSTOM_EXTENSION **b),             \
+                        comp)))
+
+#define sk_SSL_CUSTOM_EXTENSION_deep_copy(sk, copy_func, free_func)        \
+  ((STACK_OF(SSL_CUSTOM_EXTENSION) *)sk_deep_copy(                         \
+      CHECKED_CAST(const _STACK *, const STACK_OF(SSL_CUSTOM_EXTENSION) *, \
+                   sk),                                                    \
+      CHECKED_CAST(void *(*)(void *),                                      \
+                   SSL_CUSTOM_EXTENSION *(*)(SSL_CUSTOM_EXTENSION *),      \
+                   copy_func),                                             \
+      CHECKED_CAST(void (*)(void *), void (*)(SSL_CUSTOM_EXTENSION *),     \
+                   free_func)))
+
 /* STACK_OF_X509_NAME_ENTRY */
 #define sk_STACK_OF_X509_NAME_ENTRY_new(comp)                      \
   ((STACK_OF(STACK_OF_X509_NAME_ENTRY) *)sk_new(CHECKED_CAST(      \