diff --git a/src/pixiewps.c b/src/pixiewps.c
index 186ed82..f462c87 100644
--- a/src/pixiewps.c
+++ b/src/pixiewps.c
@@ -1418,6 +1418,7 @@ usage_err:
 	free(wps->e_bssid);
 	free(wps->psk1);
 	free(wps->psk2);
+	free(wps->empty_psk);
 	free(wps->e_s1);
 	free(wps->e_s2);
 	free(wps->error);