diff --git a/core/sys/windows/dwmapi.odin b/core/sys/windows/dwmapi.odin
new file mode 100644
index 000000000..468b5bb87
--- /dev/null
+++ b/core/sys/windows/dwmapi.odin
@@ -0,0 +1,9 @@
+// +build windows
+package sys_windows
+
+foreign import dwmapi "system:Dwmapi.lib"
+
+@(default_calling_convention="stdcall")
+foreign dwmapi {
+	DwmFlush :: proc() -> HRESULT ---
+}