diff --git a/testsharder/environment.go b/testsharder/environment.go
index 99e925a..37e44a3 100644
--- a/testsharder/environment.go
+++ b/testsharder/environment.go
@@ -24,11 +24,6 @@
 	// Dimensions gives the Swarming dimensions a test wishes to target.
 	Dimensions DimensionSet `json:"dimensions"`
 
-	// Label is a label given to an environment on which the testsharder may filter.
-	//
-	// TODO(joshuaseaton): deprecate in favor of tags.
-	Label string `json:"label,omitempty"`
-
 	// Tags are keys given to an environment on which the testsharder may filter.
 	Tags []string `json:"tags,omitempty"`
 
diff --git a/testsharder/shard.go b/testsharder/shard.go
index 1105b4b..a0a598e 100644
--- a/testsharder/shard.go
+++ b/testsharder/shard.go
@@ -34,11 +34,7 @@
 	envs := []Environment{}
 	for _, spec := range specs {
 		for _, env := range spec.Envs {
-			envTags := env.Tags
-			if env.Label != "" {
-				envTags = append(envTags, env.Label)
-			}
-			if !stringSlicesEq(tags, envTags) {
+			if !stringSlicesEq(tags, env.Tags) {
 				continue
 			}
 			if mode == Restricted && env.ServiceAccount != "" {