diff --git a/dlls/winex11.drv/clipboard.c b/dlls/winex11.drv/clipboard.c
index 7735b56c40e..706d378e675 100644
--- a/dlls/winex11.drv/clipboard.c
+++ b/dlls/winex11.drv/clipboard.c
@@ -790,7 +790,7 @@ static BOOL X11DRV_CLIPBOARD_RenderFormat(Display *display, LPWINE_CLIPDATA lpDa
              * data requested into the clipboard.
              */
             TRACE("Sending WM_RENDERFORMAT message to hwnd(%p)\n", cbInfo.hWndOwner);
-            SendMessageW(cbInfo.hWndOwner, WM_RENDERFORMAT, (WPARAM)lpData->wFormatID, 0);
+            SendMessageW(cbInfo.hWndOwner, WM_RENDERFORMAT, lpData->wFormatID, 0);
 
             if (!lpData->hData) bret = FALSE;
         }
diff --git a/dlls/winex11.drv/opengl.c b/dlls/winex11.drv/opengl.c
index 5bd0255e41c..e7848444fe2 100644
--- a/dlls/winex11.drv/opengl.c
+++ b/dlls/winex11.drv/opengl.c
@@ -1601,7 +1601,7 @@ static BOOL internal_SetPixelFormat(X11DRV_PDEVICE *physDev,
             return FALSE;
         }
 
-        if(!SendMessageW(hwnd, WM_X11DRV_SET_WIN_FORMAT, (WPARAM)fmt->fmt_id, 0)) {
+        if(!SendMessageW(hwnd, WM_X11DRV_SET_WIN_FORMAT, fmt->fmt_id, 0)) {
             ERR("Couldn't set format of the window, returning failure\n");
             return FALSE;
         }
diff --git a/dlls/winex11.drv/systray.c b/dlls/winex11.drv/systray.c
index ddeb2234644..bbe6b67f900 100644
--- a/dlls/winex11.drv/systray.c
+++ b/dlls/winex11.drv/systray.c
@@ -185,7 +185,7 @@ static LRESULT WINAPI tray_wndproc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lp
     case WM_MBUTTONDBLCLK:
         /* notify the owner hwnd of the message */
         TRACE("relaying 0x%x\n", msg);
-        ret = PostMessageW(icon->owner, icon->callback_message, (WPARAM) icon->id, (LPARAM) msg);
+        ret = PostMessageW(icon->owner, icon->callback_message, icon->id, msg);
         if (!ret && (GetLastError() == ERROR_INVALID_WINDOW_HANDLE))
         {
             WARN( "application window was destroyed, removing icon %u\n", icon->id );