diff --git a/prometheus/Chart.yaml b/prometheus/Chart.yaml
index 0f55020ed..4b958c3db 100644
--- a/prometheus/Chart.yaml
+++ b/prometheus/Chart.yaml
@@ -15,7 +15,7 @@ apiVersion: v1
 appVersion: v2.12.0
 description: OpenStack-Helm Prometheus
 name: prometheus
-version: 0.1.4
+version: 0.1.5
 home: https://prometheus.io/
 sources:
   - https://github.com/prometheus/prometheus
diff --git a/prometheus/templates/utils/_command_line_flags.tpl b/prometheus/templates/utils/_command_line_flags.tpl
index bb143f9d9..229fae266 100644
--- a/prometheus/templates/utils/_command_line_flags.tpl
+++ b/prometheus/templates/utils/_command_line_flags.tpl
@@ -36,11 +36,11 @@ limitations under the License.
 {{- $flag := $flag | replace "_" "-" }}
 {{- if eq $flag "web.enable-admin-api" "web.enable-lifecycle" "storage.tsdb.wal-compression" -}}
 {{- if $value }}
-{{- printf "--%s " $flag -}}
+{{- printf " --%s " $flag -}}
 {{- end -}}
 {{- else -}}
 {{- $value := $value | toString }}
-{{- printf "--%s=%s " $flag $value }}
+{{- printf " --%s=%s " $flag $value }}
 {{- end -}}
 {{- end -}}
 {{- end -}}
diff --git a/prometheus/values.yaml b/prometheus/values.yaml
index ad8f5c863..9c5b7b879 100644
--- a/prometheus/values.yaml
+++ b/prometheus/values.yaml
@@ -544,6 +544,8 @@ conf:
       web.enable_admin_api: false
       # If set to true, allows for http reloads and shutdown of Prometheus
       web.enable_lifecycle: false
+      # Enable WAL file compression
+      storage.tsdb.wal-compression: true
     scrape_configs:
       template: |
         {{- $promHost := tuple "monitoring" "public" . | include "helm-toolkit.endpoints.hostname_fqdn_endpoint_lookup" }}