diff --git a/reana/reana_dev/cluster.py b/reana/reana_dev/cluster.py
index 096e030d..9daebede 100644
--- a/reana/reana_dev/cluster.py
+++ b/reana/reana_dev/cluster.py
@@ -362,7 +362,8 @@ def job_mounts_to_config(job_mounts):
         if "reana-ui" in standard_named_exclude_components:
             values_dict["components"]["reana_ui"]["enabled"] = False
 
-    values_yaml = yaml.dump(values_dict) if values_dict else ""
+    # set arbitrary big value for `width` to prevent PyYAML from wrapping long lines
+    values_yaml = yaml.dump(values_dict, width=100000) if values_dict else ""
     helm_install = f"cat <<EOF | helm install {instance_name} helm/reana -n {namespace} --create-namespace --wait -f -\n{values_yaml}\nEOF"
 
     cmds = []