diff --git a/auth.go b/auth.go
index 302a4fad..c2143091 100644
--- a/auth.go
+++ b/auth.go
@@ -17,8 +17,8 @@ const AuthUserKey = "user"
 type Accounts map[string]string
 
 type authPair struct {
-	Value string
-	User  string
+	value string
+	user  string
 }
 
 type authPairs []authPair
@@ -28,8 +28,8 @@ func (a authPairs) searchCredential(authValue string) (string, bool) {
 		return "", false
 	}
 	for _, pair := range a {
-		if pair.Value == authValue {
-			return pair.User, true
+		if pair.value == authValue {
+			return pair.user, true
 		}
 	}
 	return "", false
@@ -74,8 +74,8 @@ func processAccounts(accounts Accounts) authPairs {
 		assert1(user != "", "User can not be empty")
 		value := authorizationHeader(user, password)
 		pairs = append(pairs, authPair{
-			Value: value,
-			User:  user,
+			value: value,
+			user:  user,
 		})
 	}
 	return pairs
diff --git a/auth_test.go b/auth_test.go
index 2f1ae70e..dc8523b0 100644
--- a/auth_test.go
+++ b/auth_test.go
@@ -22,16 +22,16 @@ func TestBasicAuth(t *testing.T) {
 
 	assert.Len(t, pairs, 3)
 	assert.Contains(t, pairs, authPair{
-		User:  "bar",
-		Value: "Basic YmFyOmZvbw==",
+		user:  "bar",
+		value: "Basic YmFyOmZvbw==",
 	})
 	assert.Contains(t, pairs, authPair{
-		User:  "foo",
-		Value: "Basic Zm9vOmJhcg==",
+		user:  "foo",
+		value: "Basic Zm9vOmJhcg==",
 	})
 	assert.Contains(t, pairs, authPair{
-		User:  "admin",
-		Value: "Basic YWRtaW46cGFzc3dvcmQ=",
+		user:  "admin",
+		value: "Basic YWRtaW46cGFzc3dvcmQ=",
 	})
 }