diff --git a/lib/libzfs/libzfs_dataset.c b/lib/libzfs/libzfs_dataset.c
index c28460b0a1..7b7c5d2a40 100644
--- a/lib/libzfs/libzfs_dataset.c
+++ b/lib/libzfs/libzfs_dataset.c
@@ -3815,7 +3815,7 @@ zfs_rollback(zfs_handle_t *zhp, zfs_handle_t *snap, boolean_t force)
 	zfs_cmd_t zc = { 0 };
 	boolean_t restore_resv = 0;
 	uint64_t old_volsize = 0, new_volsize;
-	zfs_prop_t resv_prop;
+	zfs_prop_t resv_prop = { 0 };
 
 	assert(zhp->zfs_type == ZFS_TYPE_FILESYSTEM ||
 	    zhp->zfs_type == ZFS_TYPE_VOLUME);
diff --git a/module/zfs/spa_misc.c b/module/zfs/spa_misc.c
index 485e83fcea..88775ab23f 100644
--- a/module/zfs/spa_misc.c
+++ b/module/zfs/spa_misc.c
@@ -385,7 +385,7 @@ spa_lookup(const char *name)
 	static spa_t search;	/* spa_t is large; don't allocate on stack */
 	spa_t *spa;
 	avl_index_t where;
-	char c;
+	char c = 0;
 	char *cp;
 
 	ASSERT(MUTEX_HELD(&spa_namespace_lock));
diff --git a/module/zfs/vdev_label.c b/module/zfs/vdev_label.c
index f61de3c4ef..46d0c6dd53 100644
--- a/module/zfs/vdev_label.c
+++ b/module/zfs/vdev_label.c
@@ -494,7 +494,7 @@ vdev_label_init(vdev_t *vd, uint64_t crtxg, vdev_labeltype_t reason)
 	char *buf;
 	size_t buflen;
 	int error;
-	uint64_t spare_guid, l2cache_guid;
+	uint64_t spare_guid = 0, l2cache_guid;
 	int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL;
 
 	ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL);