diff --git a/sysdeps/openbsd/glibtop_machine.h b/sysdeps/openbsd/glibtop_machine.h
index 6d31bb9b..14f6abf9 100644
--- a/sysdeps/openbsd/glibtop_machine.h
+++ b/sysdeps/openbsd/glibtop_machine.h
@@ -31,6 +31,7 @@
 #include <time.h>
 #include <sys/user.h>
 #include <sys/types.h>
+#include <sys/proc.h>
 #include <sys/sysctl.h>
 
 #include <fcntl.h>