diff --git a/cmd/zdb/zdb.c b/cmd/zdb/zdb.c
index d39178fae9..ca8dd440d1 100644
--- a/cmd/zdb/zdb.c
+++ b/cmd/zdb/zdb.c
@@ -2883,7 +2883,7 @@ find_zpool(char **target, nvlist_t **configp, int dirc, char **dirv)
 	nvlist_t *match = NULL;
 	char *name = NULL;
 	char *sepp = NULL;
-	char sep;
+	char sep = 0;
 	int count = 0;
 	importargs_t args = { 0 };
 
diff --git a/module/zfs/vdev_label.c b/module/zfs/vdev_label.c
index e46120a362..124caa3772 100644
--- a/module/zfs/vdev_label.c
+++ b/module/zfs/vdev_label.c
@@ -600,7 +600,7 @@ vdev_label_init(vdev_t *vd, uint64_t crtxg, vdev_labeltype_t reason)
 	char *buf;
 	size_t buflen;
 	int error;
-	uint64_t spare_guid = 0, l2cache_guid;
+	uint64_t spare_guid = 0, l2cache_guid = 0;
 	int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL;
 	int c, l;
 	vdev_t *pvd;