diff --git a/GreenshotPlugin/Core/WindowsHelper.cs b/GreenshotPlugin/Core/WindowsHelper.cs
index a8569adab..488063fa4 100644
--- a/GreenshotPlugin/Core/WindowsHelper.cs
+++ b/GreenshotPlugin/Core/WindowsHelper.cs
@@ -865,7 +865,7 @@ namespace GreenshotPlugin.Core  {
 				return (WindowStyleFlags)User32.GetWindowLongWrapper(hWnd, (int)WindowLongIndex.GWL_STYLE);
 			}
 			set {
-				User32.SetWindowLongWrapper(hWnd, (int)WindowLongIndex.GWL_STYLE, new IntPtr((uint)value));
+				User32.SetWindowLongWrapper(hWnd, (int)WindowLongIndex.GWL_STYLE, new IntPtr((long)value));
 			}
 		}
 
diff --git a/GreenshotPlugin/UnmanagedHelpers/Enumerations.cs b/GreenshotPlugin/UnmanagedHelpers/Enumerations.cs
index 267b56032..edd85a168 100644
--- a/GreenshotPlugin/UnmanagedHelpers/Enumerations.cs
+++ b/GreenshotPlugin/UnmanagedHelpers/Enumerations.cs
@@ -25,7 +25,7 @@ namespace GreenshotPlugin.UnmanagedHelpers {
 	/// Window Style Flags
 	/// </summary>
 	[Flags]
-    public enum WindowStyleFlags : uint {
+    public enum WindowStyleFlags : long {
 		//WS_OVERLAPPED       = 0x00000000,
 		WS_POPUP            = 0x80000000,
 		WS_CHILD            = 0x40000000,