diff --git a/gtk/gtkmountoperation-x11.c b/gtk/gtkmountoperation-x11.c
index 92914f6906..328a4be5ab 100644
--- a/gtk/gtkmountoperation-x11.c
+++ b/gtk/gtkmountoperation-x11.c
@@ -42,6 +42,13 @@
 #include <signal.h>
 #include <errno.h>
 
+#if defined(__OpenBSD__)
+#include <sys/param.h>
+#include <kvm.h>
+#include <fcntl.h>
+#include <sys/sysctl.h>
+#endif
+
 #include "gtkmountoperationprivate.h"
 
 #include "gtkalias.h"