diff --git a/packstack/plugins/prescript_000.py b/packstack/plugins/prescript_000.py
index e648935a9..e18b1e7bb 100755
--- a/packstack/plugins/prescript_000.py
+++ b/packstack/plugins/prescript_000.py
@@ -363,7 +363,7 @@ def initConfig(controller):
              ),
              "OPTION_LIST": ["y", "n"],
              "VALIDATORS": [validators.validate_options],
-             "DEFAULT_VALUE": 'y',
+             "DEFAULT_VALUE": 'n',
              "MASK_INPUT": False,
              "LOOSE_VALIDATION": False,
              "CONF_NAME": "CONFIG_NAGIOS_INSTALL",
diff --git a/releasenotes/notes/change-default-nagios-b190de0737165bf9.yaml b/releasenotes/notes/change-default-nagios-b190de0737165bf9.yaml
new file mode 100644
index 000000000..fd2d27336
--- /dev/null
+++ b/releasenotes/notes/change-default-nagios-b190de0737165bf9.yaml
@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    Default value for configuration option CONFIG_NAGIOS_INSTALL has been
+    changed to 'n' in Ocata. Users that require nagios installation in their
+    packstack deployent will need to explicitely modify it to 'y' using
+    answers file or command line option '--nagios-install'.
diff --git a/tests/scenario001.sh b/tests/scenario001.sh
index 40026328d..8f0e1a435 100755
--- a/tests/scenario001.sh
+++ b/tests/scenario001.sh
@@ -26,6 +26,7 @@ $SUDO packstack ${ADDITIONAL_ARGS} \
           --os-swift-install=n \
           --os-manila-install=y \
           --os-horizon-ssl=y \
+          --nagios-install=y \
           --amqp-enable-ssl=y \
           --glance-backend=file \
           --provision-uec-kernel-url="/tmp/cirros/cirros-0.3.4-x86_64-vmlinuz" \