diff --git a/manifests/init.pp b/manifests/init.pp
index c82c78440..3b675471b 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -82,16 +82,6 @@
 #   every 30 seconds.
 #   Defaults to $facts['os_service_default']
 #
-# [*rabbit_heartbeat_in_pthread*]
-#   (Optional) EXPERIMENTAL: Run the health check heartbeat thread
-#   through a native python thread. By default if this
-#   option isn't provided the  health check heartbeat will
-#   inherit the execution model from the parent process. By
-#   example if the parent process have monkey patched the
-#   stdlib by using eventlet/greenlet then the heartbeat
-#   will be run through a green thread.
-#   Defaults to $facts['os_service_default']
-#
 # [*rabbit_qos_prefetch_count*]
 #   (Optional) Specifies the number of messages to prefetch.
 #   Defaults to $facts['os_service_default']
@@ -366,6 +356,18 @@
 #   (Optional) Whether to use durable queues in AMQP.
 #   Defaults to $facts['os_service_default'].
 #
+# DEPRECATED PARAMETERS
+#
+# [*rabbit_heartbeat_in_pthread*]
+#   (Optional) EXPERIMENTAL: Run the health check heartbeat thread
+#   through a native python thread. By default if this
+#   option isn't provided the  health check heartbeat will
+#   inherit the execution model from the parent process. By
+#   example if the parent process have monkey patched the
+#   stdlib by using eventlet/greenlet then the heartbeat
+#   will be run through a green thread.
+#   Defaults to undef
+#
 # == Authors
 #
 #   Dan Bode dan@puppetlabs.com
@@ -390,7 +392,6 @@ class keystone(
   Boolean $enabled                                = true,
   $rabbit_heartbeat_timeout_threshold             = $facts['os_service_default'],
   $rabbit_heartbeat_rate                          = $facts['os_service_default'],
-  $rabbit_heartbeat_in_pthread                    = $facts['os_service_default'],
   $rabbit_qos_prefetch_count                      = $facts['os_service_default'],
   $rabbit_use_ssl                                 = $facts['os_service_default'],
   $default_transport_url                          = $facts['os_service_default'],
@@ -441,6 +442,8 @@ class keystone(
   $max_request_body_size                          = $facts['os_service_default'],
   Boolean $purge_config                           = false,
   $amqp_durable_queues                            = $facts['os_service_default'],
+  # DEPRECATED PARAMETERS
+  $rabbit_heartbeat_in_pthread                    = undef,
 ) inherits keystone::params {
 
   include keystone::deps
diff --git a/releasenotes/notes/deprecate-rabbit_heartbeat_in_pthread-9916241580c88e38.yaml b/releasenotes/notes/deprecate-rabbit_heartbeat_in_pthread-9916241580c88e38.yaml
new file mode 100644
index 000000000..0b90ae453
--- /dev/null
+++ b/releasenotes/notes/deprecate-rabbit_heartbeat_in_pthread-9916241580c88e38.yaml
@@ -0,0 +1,5 @@
+---
+deprecations:
+  - |
+    The ``keystone::rabbit_heartbeat_in_pthread`` parameter has been deprecated
+    and will be removed in the future release.