diff --git a/cddl/contrib/opensolaris/cmd/zfs/zfs_main.c b/cddl/contrib/opensolaris/cmd/zfs/zfs_main.c
index 425f391993f..3779b2996fb 100644
--- a/cddl/contrib/opensolaris/cmd/zfs/zfs_main.c
+++ b/cddl/contrib/opensolaris/cmd/zfs/zfs_main.c
@@ -57,6 +57,7 @@
 #include <sys/fs/zfs.h>
 #include <sys/types.h>
 #include <time.h>
+#include <err.h>
 
 #include <libzfs.h>
 #include <libzfs_core.h>