1 files changed, 2 insertions, 2 deletions

diff --git a/overlays/zte-prometheus-exporter/zte-prometheus-exporter.py b/overlays/zte-prometheus-exporter/zte-prometheus-exporter.py
index 13ff5a85..67f13716 100644
--- a/overlays/zte-prometheus-exporter/zte-prometheus-exporter.py
+++ b/overlays/zte-prometheus-exporter/zte-prometheus-exporter.py
@@ -163,7 +163,7 @@ class ZTEMetrics:
             link_metrics['dsl_uptime_seconds']['metrics'] += [({"link": link_number}, int(self.attrs['DSLINTERFACE'][link]['Showtime_start']))]
         if link_metrics:
             for metric_name in link_metrics:
-                metrics += _format_prom_metrics('dsl_{metric_name}', link_metrics[metric_name]['type'], link_metrics[metric_name]['metrics'])
+                metrics += _format_prom_metrics(f'dsl_{metric_name}', link_metrics[metric_name]['type'], link_metrics[metric_name]['metrics'])
 
         eth_metrics = dict()
         for link in self.attrs['ETH']:
@@ -178,7 +178,7 @@ class ZTEMetrics:
             eth_metrics['sent_bytes']['metrics'] += [({"link": link_number}, int(self.attrs['ETH'][link]['BytesSent']))]
         if eth_metrics:
             for metric_name in eth_metrics:
-                metrics += _format_prom_metrics('eth_{metric_name}', eth_metrics[metric_name]['type'], eth_metrics[metric_name]['metrics'])
+                metrics += _format_prom_metrics(f'eth_{metric_name}', eth_metrics[metric_name]['type'], eth_metrics[metric_name]['metrics'])
 
         return metrics.encode('utf-8')