diff --git a/reana/reana_dev/cluster.py b/reana/reana_dev/cluster.py
index c109d4b8..dc15f9b0 100644
--- a/reana/reana_dev/cluster.py
+++ b/reana/reana_dev/cluster.py
@@ -73,7 +73,7 @@ def cluster_commands():
 )
 @click.option(
     "--kind-node-version",
-    help=f"Which kindest/node image version to use?",
+    help="Which kindest/node image version to use?",
 )
 @cluster_commands.command(name="cluster-create")
 def cluster_create(
@@ -175,8 +175,8 @@ def add_volume_mounts(node):
         kind_provider = "KIND_EXPERIMENTAL_PROVIDER=podman"
 
     # create cluster
-    image_flag = ''
-    if kind_node_version != None:
+    image_flag = ""
+    if kind_node_version is not None:
         image_flag = f"--image kindest/node:{kind_node_version}"
 
     cluster_create = "cat <<EOF | {kind_provider} kind create cluster {image_flag} --config=-\n{cluster_config}\nEOF".format(