diff --git a/src/core/ngx_cycle.c b/src/core/ngx_cycle.c
index 79867079d..968056c42 100644
--- a/src/core/ngx_cycle.c
+++ b/src/core/ngx_cycle.c
@@ -418,11 +418,6 @@ ngx_init_cycle(ngx_cycle_t *old_cycle)
             goto failed;
         }
 
-        if (shm_zone[i].init == NULL) {
-            /* unused shared zone */
-            continue;
-        }
-
         shm_zone[i].shm.log = cycle->log;
 
         opart = &old_cycle->shared_memory.part;
diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index 692f50639..bb689488a 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -26,8 +26,7 @@ static void ngx_ssl_connection_error(ngx_connection_t *c, int sslerr,
     ngx_err_t err, char *text);
 static void ngx_ssl_clear_error(ngx_log_t *log);
 
-static ngx_int_t ngx_ssl_session_cache_init(ngx_shm_zone_t *shm_zone,
-    void *data);
+ngx_int_t ngx_ssl_session_cache_init(ngx_shm_zone_t *shm_zone, void *data);
 static int ngx_ssl_new_session(ngx_ssl_conn_t *ssl_conn,
     ngx_ssl_session_t *sess);
 static ngx_ssl_session_t *ngx_ssl_get_cached_session(ngx_ssl_conn_t *ssl_conn,
@@ -1505,8 +1504,6 @@ ngx_ssl_session_cache(ngx_ssl_t *ssl, ngx_str_t *sess_ctx,
     SSL_CTX_set_timeout(ssl->ctx, (long) timeout);
 
     if (shm_zone) {
-        shm_zone->init = ngx_ssl_session_cache_init;
-
         SSL_CTX_sess_set_new_cb(ssl->ctx, ngx_ssl_new_session);
         SSL_CTX_sess_set_get_cb(ssl->ctx, ngx_ssl_get_cached_session);
         SSL_CTX_sess_set_remove_cb(ssl->ctx, ngx_ssl_remove_session);
@@ -1524,7 +1521,7 @@ ngx_ssl_session_cache(ngx_ssl_t *ssl, ngx_str_t *sess_ctx,
 }
 
 
-static ngx_int_t
+ngx_int_t
 ngx_ssl_session_cache_init(ngx_shm_zone_t *shm_zone, void *data)
 {
     size_t                    len;
diff --git a/src/event/ngx_event_openssl.h b/src/event/ngx_event_openssl.h
index 204d5f08e..33cab7b3c 100644
--- a/src/event/ngx_event_openssl.h
+++ b/src/event/ngx_event_openssl.h
@@ -104,6 +104,7 @@ ngx_int_t ngx_ssl_dhparam(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *file);
 ngx_int_t ngx_ssl_ecdh_curve(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *name);
 ngx_int_t ngx_ssl_session_cache(ngx_ssl_t *ssl, ngx_str_t *sess_ctx,
     ssize_t builtin_session_cache, ngx_shm_zone_t *shm_zone, time_t timeout);
+ngx_int_t ngx_ssl_session_cache_init(ngx_shm_zone_t *shm_zone, void *data);
 ngx_int_t ngx_ssl_create_connection(ngx_ssl_t *ssl, ngx_connection_t *c,
     ngx_uint_t flags);
 
diff --git a/src/http/modules/ngx_http_ssl_module.c b/src/http/modules/ngx_http_ssl_module.c
index 120a858df..143f04d57 100644
--- a/src/http/modules/ngx_http_ssl_module.c
+++ b/src/http/modules/ngx_http_ssl_module.c
@@ -626,6 +626,8 @@ ngx_http_ssl_session_cache(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
         sscf->builtin_session_cache = NGX_SSL_NO_BUILTIN_SCACHE;
     }
 
+    sscf->shm_zone->init = ngx_ssl_session_cache_init;
+
     return NGX_CONF_OK;
 
 invalid:
diff --git a/src/mail/ngx_mail_ssl_module.c b/src/mail/ngx_mail_ssl_module.c
index 5767a2fd4..d06f7d2a9 100644
--- a/src/mail/ngx_mail_ssl_module.c
+++ b/src/mail/ngx_mail_ssl_module.c
@@ -474,6 +474,8 @@ ngx_mail_ssl_session_cache(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
         scf->builtin_session_cache = NGX_SSL_NO_BUILTIN_SCACHE;
     }
 
+    scf->shm_zone->init = ngx_ssl_session_cache_init;
+
     return NGX_CONF_OK;
 
 invalid: