diff --git a/screeninfo/enumerators/xrandr.py b/screeninfo/enumerators/xrandr.py
index b3dd018..487cdaf 100644
--- a/screeninfo/enumerators/xrandr.py
+++ b/screeninfo/enumerators/xrandr.py
@@ -97,7 +97,7 @@ def check_primary(display_id: int, crtc: XRRCrtcInfo) -> bool:
             try:
                 crtc_info = xrandr.XRRGetCrtcInfo(
                     display,
-                    ctypes.byref(output_info),
+                    screen_resources,
                     output_info.contents.crtc,
                 )