diff --git a/CHANGELOG.md b/CHANGELOG.md
index 56058b4d38ea8..9e7fc92dac411 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 
 ### Bugfixes
 - [#506](https://github.com/influxdb/telegraf/pull/506): Ping input doesn't return response time metric when timeout. Thanks @titilambert!
+- [#508](https://github.com/influxdb/telegraf/pull/508): Fix prometheus cardinality issue with the `net` plugin
 
 ## v0.10.0 [2014-01-12]
 
diff --git a/plugins/inputs/system/net.go b/plugins/inputs/system/net.go
index 95df7a741ab94..42f0d5854d63d 100644
--- a/plugins/inputs/system/net.go
+++ b/plugins/inputs/system/net.go
@@ -94,7 +94,10 @@ func (s *NetIOStats) Gather(acc inputs.Accumulator) error {
 			fields[name] = value
 		}
 	}
-	acc.AddFields("net", fields, nil)
+	tags := map[string]string{
+		"interface": "all",
+	}
+	acc.AddFields("net", fields, tags)
 
 	return nil
 }