diff --git a/QemuVmManager.Core/QemuCommandBuilder.cs b/QemuVmManager.Core/QemuCommandBuilder.cs
index dff4e20..7ab1f1a 100644
--- a/QemuVmManager.Core/QemuCommandBuilder.cs
+++ b/QemuVmManager.Core/QemuCommandBuilder.cs
@@ -322,11 +322,18 @@ public class QemuCommandBuilder
             }
         }
         
+        // Handle VNC display type with proper argument
+        if (displayType == "vnc")
+        {
+            var vncPort = display.SpicePort > 0 ? display.SpicePort : 5900;
+            displayType = $"vnc=0.0.0.0:{vncPort}";
+        }
+        
         _arguments.Add(displayType);
         
         // For X11 forwarding compatibility, use std VGA instead of virtio
         // This avoids GLX/OpenGL issues when forwarding over X11
-        if (displayType == "gtk" || displayType == "x11")
+        if (displayType.StartsWith("gtk") || displayType.StartsWith("x11"))
         {
             _arguments.Add("-vga");
             _arguments.Add("std"); // Use standard VGA for better X11 compatibility
@@ -335,6 +342,12 @@ public class QemuCommandBuilder
             _arguments.Add("-device");
             _arguments.Add("virtio-gpu-pci,edid=off"); // Use virtio-gpu without EDID
         }
+        else if (displayType.StartsWith("vnc"))
+        {
+            // For VNC, use std VGA for better compatibility
+            _arguments.Add("-vga");
+            _arguments.Add("std");
+        }
         else
         {
             _arguments.Add("-vga");