diff --git a/manifests/cache.pp b/manifests/cache.pp
index 6acc542..d0cccdf 100644
--- a/manifests/cache.pp
+++ b/manifests/cache.pp
@@ -18,6 +18,11 @@
 #   (integer value)
 #   Defaults to $facts['os_service_default']
 #
+# [*backend_expiration_time*]
+#   (Optional) Expiration time in cache backend to purge expired records
+#   automatically.
+#   Defaults to $facts['os_service_default']
+#
 # [*backend*]
 #   (Optional) Dogpile.cache backend module. It is recommended that
 #   Memcache with pooling (oslo_cache.memcache_pool) or Redis
@@ -215,6 +220,7 @@
 class zaqar::cache (
   $config_prefix                        = $facts['os_service_default'],
   $expiration_time                      = $facts['os_service_default'],
+  $backend_expiration_time              = $facts['os_service_default'],
   $backend                              = $facts['os_service_default'],
   $backend_argument                     = $facts['os_service_default'],
   $proxies                              = $facts['os_service_default'],
@@ -259,6 +265,7 @@ class zaqar::cache (
   oslo::cache { 'zaqar_config':
     config_prefix                        => $config_prefix,
     expiration_time                      => $expiration_time,
+    backend_expiration_time              => $backend_expiration_time,
     backend                              => $backend,
     backend_argument                     => $backend_argument,
     proxies                              => $proxies,
diff --git a/releasenotes/notes/cache-backend-expiration-time-46609285b7b759fe.yaml b/releasenotes/notes/cache-backend-expiration-time-46609285b7b759fe.yaml
new file mode 100644
index 0000000..cc1bed6
--- /dev/null
+++ b/releasenotes/notes/cache-backend-expiration-time-46609285b7b759fe.yaml
@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    The new ``zaqar::cache::backend_expiration_time`` parameter has been added.
diff --git a/spec/classes/zaqar_cache_spec.rb b/spec/classes/zaqar_cache_spec.rb
index 98f5c17..2139988 100644
--- a/spec/classes/zaqar_cache_spec.rb
+++ b/spec/classes/zaqar_cache_spec.rb
@@ -13,6 +13,7 @@ describe 'zaqar::cache' do
         is_expected.to contain_oslo__cache('zaqar_config').with(
           :config_prefix                        => '<SERVICE DEFAULT>',
           :expiration_time                      => '<SERVICE DEFAULT>',
+          :backend_expiration_time              => '<SERVICE DEFAULT>',
           :backend                              => '<SERVICE DEFAULT>',
           :backend_argument                     => '<SERVICE DEFAULT>',
           :proxies                              => '<SERVICE DEFAULT>',
@@ -59,6 +60,7 @@ describe 'zaqar::cache' do
         {
           :config_prefix                        => 'prefix',
           :expiration_time                      => 3600,
+          :backend_expiration_time              => 7200,
           :backend                              => 'oslo_cache.memcache_pool',
           :proxies                              => ['proxy01:8888', 'proxy02:8888'],
           :enabled                              => true,
@@ -98,6 +100,7 @@ describe 'zaqar::cache' do
         is_expected.to contain_oslo__cache('zaqar_config').with(
           :config_prefix                        => 'prefix',
           :expiration_time                      => 3600,
+          :backend_expiration_time              => 7200,
           :backend                              => 'oslo_cache.memcache_pool',
           :backend_argument                     => '<SERVICE DEFAULT>',
           :proxies                              => ['proxy01:8888', 'proxy02:8888'],