diff --git a/core/sys/windows/dwmapi.odin b/core/sys/windows/dwmapi.odin
index 11a46f53af3..0774aa0946a 100644
--- a/core/sys/windows/dwmapi.odin
+++ b/core/sys/windows/dwmapi.odin
@@ -38,6 +38,13 @@ DWMNCRENDERINGPOLICY :: enum {
 	DWMNCRP_LAST,
 }
 
+DWM_WINDOW_CORNER_PREFERENCE :: enum c_int{
+   DEFAULT,
+   DONOTROUND,
+   ROUND,
+   ROUNDSMALL,
+}
+
 @(default_calling_convention="system")
 foreign dwmapi {
 	DwmFlush :: proc() -> HRESULT ---