diff --git a/sdk/include/reactos/rosctrls.h b/sdk/include/reactos/rosctrls.h
index 6d3481a0420..e81a0c4cfbb 100644
--- a/sdk/include/reactos/rosctrls.h
+++ b/sdk/include/reactos/rosctrls.h
@@ -280,7 +280,7 @@ public: // Configuration methods
 
     DWORD SetTooltip(HWND hWndTooltip)
     {
-        return SendMessageW(TB_SETTOOLTIPS, hWndTooltip, 0);
+        return SendMessageW(TB_SETTOOLTIPS, reinterpret_cast<WPARAM>(hWndTooltip), 0);
     }
 
     INT GetHotItem()