diff --git a/gdk/win32/gdkdrop-win32.c b/gdk/win32/gdkdrop-win32.c
index 7ca058aa14..4c7f4dfafe 100644
--- a/gdk/win32/gdkdrop-win32.c
+++ b/gdk/win32/gdkdrop-win32.c
@@ -300,8 +300,7 @@ query_object_formats (GdkDisplay   *display,
       hr = IEnumFORMATETC_Next (pfmt, 1, &fmt, NULL);
     }
 
-  if (pfmt)
-    IEnumFORMATETC_Release (pfmt);
+  gdk_win32_com_clear (&pfmt);
 
   result_formats = gdk_content_formats_builder_free_to_formats (builder);
 
@@ -311,8 +310,7 @@ query_object_formats (GdkDisplay   *display,
 static void
 set_data_object (LPDATAOBJECT *location, LPDATAOBJECT data_object)
 {
-  if (*location != NULL)
-    IDataObject_Release (*location);
+  gdk_win32_com_clear (location);
 
   *location = data_object;
 
diff --git a/gdk/win32/gdkinput-dmanipulation.c b/gdk/win32/gdkinput-dmanipulation.c
index 6148e512eb..5e9ea0eebe 100644
--- a/gdk/win32/gdkinput-dmanipulation.c
+++ b/gdk/win32/gdkinput-dmanipulation.c
@@ -37,6 +37,7 @@
 #include "gdkdevice-virtual.h"
 #include "gdkdeviceprivate.h"
 #include "gdkdisplay-win32.h"
+#include "gdkprivate-win32.h"
 #include "gdkeventsprivate.h"
 #include "gdkseatdefaultprivate.h"
 #include "gdkinput-dmanipulation.h"
@@ -359,7 +360,7 @@ reset_viewport (IDirectManipulationViewport *viewport)
   HR_CHECK_GOTO (hr, failed);
 
 failed:
-  IUnknown_Release (content);
+  gdk_win32_com_clear (&content);
 }
 
 static void
@@ -391,8 +392,7 @@ gdk_win32_display_close_dmanip_manager (GdkDisplay *display)
     {
       IDirectManipulationManager *manager = GDK_DISPLAY_GET_DMANIP_MANAGER (display);
 
-      if (manager != NULL)
-        IUnknown_Release (manager);
+      gdk_win32_com_clear (&manager);
 
       g_clear_pointer (&GDK_WIN32_DISPLAY (display)->dmanip_items, g_free);
     }
@@ -451,8 +451,7 @@ create_viewport (GdkSurface *surface,
   return;
 
 failed:
-  if (handler)
-    IUnknown_Release (handler);
+  gdk_win32_com_clear (&handler);
 
   close_viewport (pViewport);
 }