diff --git a/black_screen_dim.py b/black_screen_dim.py
index 5151e5b..66e16df 100644
--- a/black_screen_dim.py
+++ b/black_screen_dim.py
@@ -66,7 +66,7 @@ class BrightnessController:
     def _open_physical(self, hmon):
         dx = ctypes.windll.dxva2
         arr = (BrightnessController.PHYSICAL_MONITOR * 1)()
-        if not dx.GetPhysicalMonitorsFromHMONITOR(int(hmon), 1, ctypes.byref(arr)):
+        if not dx.GetPhysicalMonitorsFromHMONITOR(int(hmon), 1, arr):
             return None
         return arr[0].hPhysicalMonitor
 
@@ -89,7 +89,7 @@ class BrightnessController:
         dx = ctypes.windll.dxva2
         arr = (BrightnessController.PHYSICAL_MONITOR * 1)()
         arr[0].hPhysicalMonitor = handle
-        dx.DestroyPhysicalMonitors(1, ctypes.byref(arr))
+        dx.DestroyPhysicalMonitors(1, arr)
 
     def _build(self):
         self.targets = []