diff --git a/google/example_test.go b/google/example_test.go
index ac61db2..2958692 100644
--- a/google/example_test.go
+++ b/google/example_test.go
@@ -63,7 +63,7 @@ func ExampleJWTConfigFromJSON() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	conf, err := google.JWTConfigFromJSON(oauth2.NoContext, data, "https://www.googleapis.com/auth/bigquery")
+	conf, err := google.JWTConfigFromJSON(data, "https://www.googleapis.com/auth/bigquery")
 	if err != nil {
 		log.Fatal(err)
 	}
diff --git a/google/google.go b/google/google.go
index c65b800..bbe6a38 100644
--- a/google/google.go
+++ b/google/google.go
@@ -41,7 +41,7 @@ const JWTTokenURL = "https://accounts.google.com/o/oauth2/token"
 // the credentials that authorize and authenticate the requests.
 // Create a service account on "Credentials" page under "APIs & Auth" for your
 // project at https://console.developers.google.com to download a JSON key file.
-func JWTConfigFromJSON(ctx oauth2.Context, jsonKey []byte, scope ...string) (*jwt.Config, error) {
+func JWTConfigFromJSON(jsonKey []byte, scope ...string) (*jwt.Config, error) {
 	var key struct {
 		Email      string `json:"client_email"`
 		PrivateKey string `json:"private_key"`