diff --git a/cddl/compat/opensolaris/misc/zmount.c b/cddl/compat/opensolaris/misc/zmount.c
index b4f99e3be9fd..d46b378ea92a 100644
--- a/cddl/compat/opensolaris/misc/zmount.c
+++ b/cddl/compat/opensolaris/misc/zmount.c
@@ -98,8 +98,10 @@ zmount(const char *spec, const char *dir, int mflag, char *fstype,
 	build_iovec(&iov, &iovlen, "fspath", __DECONST(char *, dir),
 	    (size_t)-1);
 	build_iovec(&iov, &iovlen, "from", __DECONST(char *, spec), (size_t)-1);
-	for (p = optstr; p != NULL; strsep(&p, ",/ "))
-		build_iovec(&iov, &iovlen, p, NULL, (size_t)-1);
+	for (p = optstr; p != NULL; strsep(&p, ",/ ")) {
+		if (*p != '\0')
+			build_iovec(&iov, &iovlen, p, NULL, (size_t)-1);
+	}
 	rv = nmount(iov, iovlen, 0);
 	free(optstr);
 	return (rv);