diff --git a/mktxp/datasource/dhcp_ds.py b/mktxp/datasource/dhcp_ds.py
index 6744ddc..1ff86e4 100644
--- a/mktxp/datasource/dhcp_ds.py
+++ b/mktxp/datasource/dhcp_ds.py
@@ -32,7 +32,7 @@ class DHCPMetricsDataSource:
             if 'host_name' in metric_labels:
                 translation_table['host_name'] = lambda c: c if c else ''           
             if 'expires_after' in metric_labels:
-                translation_table['expires_after'] = lambda c: parse_mkt_uptime(c)        
+                translation_table['expires_after'] = lambda c: parse_mkt_uptime(c) if c else 0       
             if 'active_address' in metric_labels:
                 translation_table['active_address'] = lambda c: c if c else ''