diff --git a/manifests/cache.pp b/manifests/cache.pp
index 80f86b0..9ec9725 100644
--- a/manifests/cache.pp
+++ b/manifests/cache.pp
@@ -94,7 +94,7 @@
 # [*memcache_socket_timeout*]
 #   (Optional) Timeout in seconds for every call to a server.
 #   (dogpile.cache.memcache and oslo_cache.memcache_pool backends only).
-#   (integer value)
+#   (floating point value)
 #   Defaults to $::os_service_default
 #
 # [*memcache_pool_maxsize*]
diff --git a/releasenotes/notes/memcache_socket_timeout-9daa8981f42caf41.yaml b/releasenotes/notes/memcache_socket_timeout-9daa8981f42caf41.yaml
new file mode 100644
index 0000000..d684072
--- /dev/null
+++ b/releasenotes/notes/memcache_socket_timeout-9daa8981f42caf41.yaml
@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    `memcache_socket_timeout` is changed to float value.
diff --git a/spec/defines/oslo_cache_spec.rb b/spec/defines/oslo_cache_spec.rb
index 6c25f87..21025b3 100644
--- a/spec/defines/oslo_cache_spec.rb
+++ b/spec/defines/oslo_cache_spec.rb
@@ -36,7 +36,7 @@ describe 'oslo::cache' do
           :debug_cache_backend                  => true,
           :memcache_servers                     => ['host1:11211', 'host2:11211','[fd12:3456:789a:1::1]:11211'],
           :memcache_dead_retry                  => '300',
-          :memcache_socket_timeout              => '3',
+          :memcache_socket_timeout              => '3.0',
           :memcache_pool_maxsize                => '10',
           :memcache_pool_unused_timeout         => '60',
           :memcache_pool_connection_get_timeout => '10',
@@ -53,7 +53,7 @@ describe 'oslo::cache' do
         is_expected.to contain_keystone_config('cache/debug_cache_backend').with_value('true')
         is_expected.to contain_keystone_config('cache/memcache_servers').with_value('host1:11211,host2:11211,inet6:[fd12:3456:789a:1::1]:11211')
         is_expected.to contain_keystone_config('cache/memcache_dead_retry').with_value('300')
-        is_expected.to contain_keystone_config('cache/memcache_socket_timeout').with_value('3')
+        is_expected.to contain_keystone_config('cache/memcache_socket_timeout').with_value('3.0')
         is_expected.to contain_keystone_config('cache/memcache_pool_maxsize').with_value('10')
         is_expected.to contain_keystone_config('cache/memcache_pool_unused_timeout').with_value('60')
         is_expected.to contain_keystone_config('cache/memcache_pool_connection_get_timeout').with_value('10')