diff --git a/releasenotes/notes/fix_nvdimm_ns_check-cb0837b5dbf40ab7.yaml b/releasenotes/notes/fix_nvdimm_ns_check-cb0837b5dbf40ab7.yaml
new file mode 100644
index 000000000..ac813022c
--- /dev/null
+++ b/releasenotes/notes/fix_nvdimm_ns_check-cb0837b5dbf40ab7.yaml
@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    Due to the use of a folding block operator instead of the literal block
+    operator the check for existing namespaces does not work correct and
+    namespaces get created on subsequent deploy runs even if they already
+    exist. Now namespaces won't get created if the are already there.
diff --git a/tripleo_ansible/roles/tripleo_nvdimm/tasks/create_namespaces.yml b/tripleo_ansible/roles/tripleo_nvdimm/tasks/create_namespaces.yml
index 795fcb01b..3edbdbdf9 100644
--- a/tripleo_ansible/roles/tripleo_nvdimm/tasks/create_namespaces.yml
+++ b/tripleo_ansible/roles/tripleo_nvdimm/tasks/create_namespaces.yml
@@ -15,15 +15,15 @@
 # under the License.
 
 - name: list current namespaces
-  shell: >-
-    ndctl list -X | jq ".[].name"
+  shell: |
+    ndctl list -X | jq -r ".[].name"
   register: namespaces
   changed_when: false
 - name: create namespace
   command: >-
     ndctl create-namespace -s {{ input[0] }} -m devdax -M mem -n {{ input[1] }}
   when:
-    - namespaces.stdout is defined
-    - input[1] not in namespaces.stdout
+    - namespaces.stdout_lines is defined
+    - input[1] not in namespaces.stdout_lines
   register: ret
   changed_when: ret.rc == 0