diff --git a/include/libzutil.h b/include/libzutil.h
index 001ece228..59599b0f6 100644
--- a/include/libzutil.h
+++ b/include/libzutil.h
@@ -165,6 +165,7 @@ _LIBZUTIL_H void zfs_nicetime(uint64_t, char *, size_t);
 _LIBZUTIL_H void zfs_niceraw(uint64_t, char *, size_t);
 
 #define	nicenum(num, buf, size)	zfs_nicenum(num, buf, size)
+#define	NN_NUMBUF_SZ	(6)
 
 _LIBZUTIL_H void zpool_dump_ddt(const ddt_stat_t *, const ddt_histogram_t *);
 _LIBZUTIL_H int zpool_history_unpack(char *, uint64_t, uint64_t *, nvlist_t ***,
diff --git a/include/sys/zfs_context.h b/include/sys/zfs_context.h
index 08c0b58a5..d010b4eb3 100644
--- a/include/sys/zfs_context.h
+++ b/include/sys/zfs_context.h
@@ -145,8 +145,6 @@ extern "C" {
 typedef off_t loff_t;
 #endif
 
-#define	NN_NUMBUF_SZ	(6)
-
 /*
  * Kernel modules
  */