diff --git a/builder/command/command.go b/builder/command/command.go
index dd24ee44c550c0dc03d300fa0afe12f0fb2f12d2..16544f0267c07375f43fb09ff9853c276670829d 100644
--- a/builder/command/command.go
+++ b/builder/command/command.go
@@ -22,6 +22,7 @@ const (
 // Commands is list of all Dockerfile commands
 var Commands = map[string]struct{}{
 	Env:        {},
+	Label:      {},
 	Maintainer: {},
 	Add:        {},
 	Copy:       {},
diff --git a/builder/dispatchers.go b/builder/dispatchers.go
index 965fd68c039f65942e7ba2fe7ed834764a74e254..3cb3a9fb3afecc18a5d0ede2d2934757304cb007 100644
--- a/builder/dispatchers.go
+++ b/builder/dispatchers.go
@@ -91,7 +91,7 @@ func maintainer(b *Builder, args []string, attributes map[string]bool, original
 //
 func label(b *Builder, args []string, attributes map[string]bool, original string) error {
 	if len(args) == 0 {
-		return fmt.Errorf("LABEL is missing arguments")
+		return fmt.Errorf("LABEL requires at least one argument")
 	}
 	if len(args)%2 != 0 {
 		// should never get here, but just in case
diff --git a/builder/evaluator.go b/builder/evaluator.go
index aee60426c15f1c78f47c11e2ebf40230b9c10bda..9808a3c42de1ce36f950a168341c4dc0c078d359 100644
--- a/builder/evaluator.go
+++ b/builder/evaluator.go
@@ -49,6 +49,7 @@ var (
 // Environment variable interpolation will happen on these statements only.
 var replaceEnvAllowed = map[string]struct{}{
 	command.Env:     {},
+	command.Label:   {},
 	command.Add:     {},
 	command.Copy:    {},
 	command.Workdir: {},
diff --git a/builder/parser/line_parsers.go b/builder/parser/line_parsers.go
index 06115e831a542d6d5784c361ac44eb8101aef315..45c929ee69e33547502b7b32f0044f6f5014b3dc 100644
--- a/builder/parser/line_parsers.go
+++ b/builder/parser/line_parsers.go
@@ -137,7 +137,7 @@ func parseNameVal(rest string, key string) (*Node, map[string]bool, error) {
 	}
 
 	if len(words) == 0 {
-		return nil, nil, fmt.Errorf(key + " requires at least one argument")
+		return nil, nil, nil
 	}
 
 	// Old format (KEY name value)