diff --git a/Assets/Test/Randomizer.cs b/Assets/Test/Randomizer.cs
index 7d23326..db867ea 100644
--- a/Assets/Test/Randomizer.cs
+++ b/Assets/Test/Randomizer.cs
@@ -4,7 +4,7 @@
 
 public class Randomizer : MonoBehaviour
 {
-    [SerializeField] GameObject[] _objects;
+    [SerializeField] GameObject[] _objects = null;
 
     IEnumerator Start()
     {
diff --git a/Assets/Test/SourceSelector.cs b/Assets/Test/SourceSelector.cs
index 07728f9..199b7a2 100644
--- a/Assets/Test/SourceSelector.cs
+++ b/Assets/Test/SourceSelector.cs
@@ -8,7 +8,7 @@
 
 public class SourceSelector : MonoBehaviour
 {
-    [SerializeField] Dropdown _dropdown;
+    [SerializeField] Dropdown _dropdown = null;
 
     SpoutReceiver _receiver;
 
diff --git a/Assets/Test/TestCards/Runtime/TestOverlay.cs b/Assets/Test/TestCards/Runtime/TestOverlay.cs
index 5f46418..4448bce 100644
--- a/Assets/Test/TestCards/Runtime/TestOverlay.cs
+++ b/Assets/Test/TestCards/Runtime/TestOverlay.cs
@@ -35,7 +35,7 @@ public int scale {
 
         #region Private members
 
-        [SerializeField, HideInInspector] Shader _shader;
+        [SerializeField, HideInInspector] Shader _shader = null;
         Material _material;
 
         #endregion