diff --git a/Scripts/Editor/MenuPopup/MenuTreeView.cs b/Scripts/Editor/MenuPopup/MenuTreeView.cs
index 60e3423..aa81fed 100644
--- a/Scripts/Editor/MenuPopup/MenuTreeView.cs
+++ b/Scripts/Editor/MenuPopup/MenuTreeView.cs
@@ -88,7 +88,7 @@ namespace XNodeEditor
                         }
                     }
                     
-                    var temp = new TreeViewItem(id++,depth++,path);
+                    TreeViewItem temp = new TreeViewItem(id++,depth++,path);
                     
                     last.AddChild(temp);
                     
@@ -114,7 +114,7 @@ namespace XNodeEditor
         List<int> ids = new List<int>();
         protected override void DoubleClickedItem(int id)
         {
-            var item = FindItem(id,Root);
+            TreeViewItem item = FindItem(id,Root);
             if (item.hasChildren)
             {
                 if (hasSearch)
diff --git a/Scripts/Editor/NodeEditor.cs b/Scripts/Editor/NodeEditor.cs
index f6dda2f..226f419 100644
--- a/Scripts/Editor/NodeEditor.cs
+++ b/Scripts/Editor/NodeEditor.cs
@@ -30,7 +30,7 @@ namespace XNodeEditor {
         {
             excludesField = new List<string> { "m_Script", "graph", "position", "ports" };
 
-            var fields = GetExcludesField();
+            IEnumerable<string> fields = GetExcludesField();
 
             if (fields != null)
             {
diff --git a/Scripts/Editor/NodeEditorGUI.cs b/Scripts/Editor/NodeEditorGUI.cs
index 65d3aa6..088998f 100755
--- a/Scripts/Editor/NodeEditorGUI.cs
+++ b/Scripts/Editor/NodeEditorGUI.cs
@@ -44,11 +44,11 @@ namespace XNodeEditor {
 
         private void DrawGroupName()
         {
-            var guiContent = new GUIContent(this.graph.name);
-            var col = EditorStyles.label.normal.textColor;
+            GUIContent guiContent = new GUIContent(this.graph.name);
+            Color col = EditorStyles.label.normal.textColor;
             var fontSize = EditorStyles.label.fontSize;
             EditorStyles.label.fontSize = 48;
-            var size = GUILayoutUtility.GetRect(guiContent, EditorStyles.label);
+            Rect size = GUILayoutUtility.GetRect(guiContent, EditorStyles.label);
             EditorStyles.label.normal.textColor = new Color(175 / 255f, 185 / 255f, 185 / 255f);
             EditorGUI.LabelField(new Rect(new Vector2(5, 5), size.size), guiContent);
             EditorStyles.label.fontSize = fontSize;
diff --git a/Scripts/Editor/NodeEditorWindow.cs b/Scripts/Editor/NodeEditorWindow.cs
index 6d5150d..4c018ea 100644
--- a/Scripts/Editor/NodeEditorWindow.cs
+++ b/Scripts/Editor/NodeEditorWindow.cs
@@ -29,7 +29,7 @@ namespace XNodeEditor {
         [MenuItem("xNode/Close All Editor Window")]
         static void CloseAllNodeEditorWindow()
         {
-            var windows = Resources.FindObjectsOfTypeAll<NodeEditorWindow>();
+            NodeEditorWindow[] windows = Resources.FindObjectsOfTypeAll<NodeEditorWindow>();
 
             foreach (var window in windows)
             {