diff --git a/src/test/util_test.go b/src/test/util_test.go
index a33217719dc8ea2ec648f53932955c96ba193b21..ac22fff05f5e8496e7c3febff004d5d150ec61d1 100644
--- a/src/test/util_test.go
+++ b/src/test/util_test.go
@@ -34,22 +34,21 @@ func TestClearByteArray(t *testing.T) {
 }
 
 func TestReadTokenFromEnvironment1(t *testing.T) {
-	os.Setenv("ak", "ZXhhbXBsZUFL")
-	os.Setenv("sk", "ZXhhbXBsZVNL")
+	os.Setenv("AK", "ZXhhbXBsZUFL")
+	os.Setenv("SK", "ZXhhbXBsZVNL")
 	err := util.ReadTokenFromEnvironment()
-	assert.EqualValues(t, 0, len(os.Getenv("ak")))
-	assert.EqualValues(t, 0, len(os.Getenv("sk")))
+	assert.EqualValues(t, 0, len(os.Getenv("AK")))
+	assert.EqualValues(t, 0, len(os.Getenv("SK")))
 	assert.NoError(t, err, "No error is expected")
 }
 
 func TestReadTokenFromEnvironment2(t *testing.T) {
-	os.Setenv("ak", "ZXhhbXBsZUFL")
+	os.Setenv("AK", "ZXhhbXBsZUFL")
 	err := util.ReadTokenFromEnvironment()
 	Expected := "ak and sk keys should be set in env variable"
 	assert.EqualError(t, err, Expected)
 }
 
-
 func TestGetAppInstanceIdDecodeFailed(t *testing.T) {
 	os.Setenv("APPINSTID", "b1fe5b4d-76a7-4a52-b60f-932fde7c8d57")
 	_, err := util.GetAppInstanceID()
diff --git a/src/util/util.go b/src/util/util.go
index 0d6b9a8eae78d5fa066b14d962c67cf8faa1501b..637ddc4f0323f26d3629bbcc2beee3431867fef4 100644
--- a/src/util/util.go
+++ b/src/util/util.go
@@ -47,8 +47,8 @@ var RefreshTimer *time.Timer
 const RefreshTimeBuffer = 5
 
 const (
-	ak        string = "ak"
-	sk        string = "sk"
+	ak        string = "AK"
+	sk        string = "SK"
 	appInstID string = "APPINSTID"
 )