diff --git a/app/src/main/java/eu/rickvanschijndel/solargraph/ResponseCode.kt b/app/src/main/java/eu/rickvanschijndel/solargraph/ResponseCode.kt
new file mode 100644
index 0000000..c5ba534
--- /dev/null
+++ b/app/src/main/java/eu/rickvanschijndel/solargraph/ResponseCode.kt
@@ -0,0 +1,6 @@
+package eu.rickvanschijndel.solargraph
+
+object ResponseCode {
+    const val OK = 200
+    const val UNAUTHORIZED = 401
+}
diff --git a/app/src/main/java/eu/rickvanschijndel/solargraph/activities/GraphActivity.kt b/app/src/main/java/eu/rickvanschijndel/solargraph/activities/GraphActivity.kt
index 864fcd4..168b500 100644
--- a/app/src/main/java/eu/rickvanschijndel/solargraph/activities/GraphActivity.kt
+++ b/app/src/main/java/eu/rickvanschijndel/solargraph/activities/GraphActivity.kt
@@ -16,6 +16,7 @@ import com.github.mikephil.charting.data.LineDataSet
 import com.github.mikephil.charting.highlight.Highlight
 import com.github.mikephil.charting.listener.OnChartValueSelectedListener
 import eu.rickvanschijndel.solargraph.R
+import eu.rickvanschijndel.solargraph.ResponseCode
 import eu.rickvanschijndel.solargraph.models.ProductionResponse
 import eu.rickvanschijndel.solargraph.rest.ApiImpl
 import io.reactivex.Single
@@ -27,7 +28,6 @@ import retrofit2.Response
 import java.text.SimpleDateFormat
 import java.util.Locale
 import java.util.Date
-
 import kotlinx.android.synthetic.main.activity_graph.network_info
 import kotlinx.android.synthetic.main.activity_graph.today_power
 import kotlinx.android.synthetic.main.activity_graph.monthly_power
@@ -40,8 +40,6 @@ class GraphActivity : AppCompatActivity() {
 
     companion object {
         private const val TAG = "GraphActivity"
-        private const val RESPONSE_OK = 200
-        private const val RESPONSE_UNAUTHORIZED = 401
     }
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -98,11 +96,11 @@ class GraphActivity : AppCompatActivity() {
                 ?.subscribe(object: SingleObserver<Response<ProductionResponse>> {
                     override fun onSuccess(response: Response<ProductionResponse>) {
                         when(response.code()) {
-                            RESPONSE_OK -> {
+                            ResponseCode.OK -> {
                                 val body = response.body()!!
                                 onDataRetrieved(body)
                             }
-                            RESPONSE_UNAUTHORIZED -> {
+                            ResponseCode.UNAUTHORIZED -> {
                                 removeUsernameAndPassword()
                                 restartApplication()
                             }
diff --git a/app/src/main/java/eu/rickvanschijndel/solargraph/activities/LoginActivity.kt b/app/src/main/java/eu/rickvanschijndel/solargraph/activities/LoginActivity.kt
index 72ad22a..4fa55e2 100644
--- a/app/src/main/java/eu/rickvanschijndel/solargraph/activities/LoginActivity.kt
+++ b/app/src/main/java/eu/rickvanschijndel/solargraph/activities/LoginActivity.kt
@@ -9,6 +9,7 @@ import android.os.Bundle
 import android.preference.PreferenceManager
 import android.support.design.widget.Snackbar
 import eu.rickvanschijndel.solargraph.R
+import eu.rickvanschijndel.solargraph.ResponseCode
 import eu.rickvanschijndel.solargraph.models.SiteResponse
 import eu.rickvanschijndel.solargraph.rest.ApiImpl
 import io.reactivex.SingleObserver
@@ -69,14 +70,14 @@ class LoginActivity : AppCompatActivity() {
                     .subscribe(object: SingleObserver<Response<Collection<SiteResponse>>> {
                         override fun onSuccess(response: Response<Collection<SiteResponse>>) {
                             when(response.code()) {
-                                200 -> {
+                                ResponseCode.OK -> {
                                     saveUsernameAndPassword()
                                     val graphActivity = Intent(applicationContext, GraphActivity::class.java)
                                     startActivity(graphActivity)
                                     finish()
                                 }
 
-                                401 -> {
+                                ResponseCode.UNAUTHORIZED -> {
                                     notifyLoginFailure(response.message())
                                     return
                                 }