diff --git a/vendor/github.com/prometheus/common/log/log.go b/vendor/github.com/prometheus/common/log/log.go
index efad4842f3..0a74a7f92a 100644
--- a/vendor/github.com/prometheus/common/log/log.go
+++ b/vendor/github.com/prometheus/common/log/log.go
@@ -32,7 +32,7 @@ type levelFlag string
 
 // String implements flag.Value.
 func (f levelFlag) String() string {
-	return fmt.Sprintf("%q", string(f))
+	return fmt.Sprintf("%q", origLogger.Level.String())
 }
 
 // Set implements flag.Value.
diff --git a/vendor/vendor.json b/vendor/vendor.json
index 0b5a1edaa6..a54aff40cb 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -543,10 +543,10 @@
 			"revisionTime": "2017-01-08T23:12:12Z"
 		},
 		{
-			"checksumSHA1": "ZA4MLHNAP905WiAOLy4BBzmcuxM=",
+			"checksumSHA1": "vfkLfDs6hXtxdJNGdWQglsxFu40=",
 			"path": "github.com/prometheus/common/log",
-			"revision": "dd2f054febf4a6c00f2343686efb775948a8bff4",
-			"revisionTime": "2017-01-08T23:12:12Z"
+			"revision": "75882ff176da1a10e2705adadd81edfd3a50d743",
+			"revisionTime": "2017-04-27T09:48:40Z"
 		},
 		{
 			"checksumSHA1": "0LL9u9tfv1KPBjNEiMDP6q7lpog=",