diff --git a/src/prometheus_alert_rules/smart.yaml b/src/prometheus_alert_rules/smart.yaml
index b067fad..d4a31df 100644
--- a/src/prometheus_alert_rules/smart.yaml
+++ b/src/prometheus_alert_rules/smart.yaml
@@ -88,7 +88,7 @@ groups:
 
   - alert: SmartAttributeWarning
     # based on https://www.backblaze.com/blog/what-smart-stats-indicate-hard-drive-failures/
-    expr: smartctl_device_attribute{attribute_id=~"5|187|188|197|198"} > 0
+    expr: smartctl_device_attribute{attribute_id=~"5|187|188|197|198", attribute_value_type="raw"} > 0
     for: 2m
     labels:
       severity: warning
@@ -124,4 +124,4 @@ groups:
         The NVMe drive has reached 90% of its estimated lifetime.
         Note: A value of 100 does not indicate failure. For more details, visit https://charmhub.io/hardware-observer/docs/metrics-and-alerts-smart
           VALUE = {{ $value }}
-          LABELS = {{ $labels }}
\ No newline at end of file
+          LABELS = {{ $labels }}