diff --git a/src/lib/arch/win32/ArchTaskBarWindows.cpp b/src/lib/arch/win32/ArchTaskBarWindows.cpp
index 7de57de2..f87a595b 100644
--- a/src/lib/arch/win32/ArchTaskBarWindows.cpp
+++ b/src/lib/arch/win32/ArchTaskBarWindows.cpp
@@ -417,7 +417,7 @@ ArchTaskBarWindows::staticWndProc(HWND hwnd, UINT msg,
 		createInfo = reinterpret_cast<CREATESTRUCT*>(lParam);
 		self       = static_cast<ArchTaskBarWindows*>(
 												createInfo->lpCreateParams);
-		SetWindowLongPtr(hwnd, 0, self);
+		SetWindowLongPtr(hwnd, 0, reinterpret_cast<LONG_PTR>(createInfo->lpCreateParams));
 	}
 	else {
 		// get the extra window data and forward the call