diff --git a/zfs/lib/libnvpair/nvpair.c b/zfs/lib/libnvpair/nvpair.c
index cee02a04bd..81f22deeea 100644
--- a/zfs/lib/libnvpair/nvpair.c
+++ b/zfs/lib/libnvpair/nvpair.c
@@ -1560,7 +1560,7 @@ nvlist_lookup_nvpair_ei_sep(nvlist_t *nvl, const char *name, const char sep,
 {
 	nvpair_t	*nvp;
 	const char	*np;
-	char		*sepp;
+	char		*sepp = NULL;
 	char		*idxp, *idxep;
 	nvlist_t	**nva;
 	long		idx;