diff --git a/user/drbdadm_adjust.c b/user/drbdadm_adjust.c
index cb23270..3a751ca 100644
--- a/user/drbdadm_adjust.c
+++ b/user/drbdadm_adjust.c
@@ -29,6 +29,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
+#include <sys/sysmacros.h>
 #include <unistd.h>
 #include <fcntl.h>
 
diff --git a/user/legacy/drbdadm_adjust.c b/user/legacy/drbdadm_adjust.c
index c79163c..6990ffb 100644
--- a/user/legacy/drbdadm_adjust.c
+++ b/user/legacy/drbdadm_adjust.c
@@ -27,6 +27,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
+#include <sys/sysmacros.h>
 #include <unistd.h>
 #include <fcntl.h>