diff --git a/Scripts/Editor/NodeEditorAction.cs b/Scripts/Editor/NodeEditorAction.cs
index f9a81fb..1a02556 100644
--- a/Scripts/Editor/NodeEditorAction.cs
+++ b/Scripts/Editor/NodeEditorAction.cs
@@ -535,8 +535,8 @@ namespace XNodeEditor {
             XNode.NodePort inputPort = node.Ports.FirstOrDefault(x => x.IsInput && x.ValueType == autoConnectOutput.ValueType);
             // Fallback to input port
             if (inputPort == null) inputPort = node.Ports.FirstOrDefault(x => x.IsInput);
-            // Autoconnect
-            if (inputPort != null) autoConnectOutput.Connect(inputPort);
+            // Autoconnect if connection is compatible
+            if (inputPort != null && inputPort.CanConnectTo(autoConnectOutput)) autoConnectOutput.Connect(inputPort);
 
             // Save changes
             EditorUtility.SetDirty(graph);
@@ -544,4 +544,4 @@ namespace XNodeEditor {
             autoConnectOutput = null;
         }
     }
-}
\ No newline at end of file
+}