diff --git a/docs/storage/driver/swift/swift_test.go b/docs/storage/driver/swift/swift_test.go
index b4f1c7384..655aa9963 100644
--- a/docs/storage/driver/swift/swift_test.go
+++ b/docs/storage/driver/swift/swift_test.go
@@ -53,7 +53,7 @@ func init() {
 	trustID = os.Getenv("SWIFT_TRUST_ID")
 	container = os.Getenv("SWIFT_CONTAINER_NAME")
 	region = os.Getenv("SWIFT_REGION_NAME")
-	AuthVersion = strconv.Atoi(os.Getenv("SWIFT_AUTH_VERSION"))
+	AuthVersion, _ = strconv.Atoi(os.Getenv("SWIFT_AUTH_VERSION"))
 	insecureSkipVerify, _ = strconv.ParseBool(os.Getenv("SWIFT_INSECURESKIPVERIFY"))
 	secretKey = os.Getenv("SWIFT_SECRET_KEY")
 	accessKey = os.Getenv("SWIFT_ACCESS_KEY")