diff --git a/Assets/XLua/Src/CodeEmit.cs b/Assets/XLua/Src/CodeEmit.cs
index 50e36c45af9f8897440149ef307335f37984d35a..119987d5eb60d925b609f11d2e7ac7ead1841097 100644
--- a/Assets/XLua/Src/CodeEmit.cs
+++ b/Assets/XLua/Src/CodeEmit.cs
@@ -673,10 +673,14 @@ namespace XLua
                 {
                     il.Emit(OpCodes.Ldc_I4, Convert.ToInt32(obj));
                 }
-                else if (typeof(long) == type || typeof(ulong) == type)
+                else if (typeof(long) == type)
                 {
                     il.Emit(OpCodes.Ldc_I8, Convert.ToInt64(obj));
                 }
+                else if (typeof(ulong) == type)
+                {
+                    il.Emit(OpCodes.Ldc_I8, (long)Convert.ToUInt64(obj));
+                }
                 else if (typeof(IntPtr) == type || typeof(IntPtr) == type)
                 {
                     il.Emit(OpCodes.Ldloca, localIndex);