diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c
index 5ad46f7f514f..38026650c038 100644
--- a/drivers/net/ieee802154/at86rf230.c
+++ b/drivers/net/ieee802154/at86rf230.c
@@ -1173,7 +1173,7 @@ at86rf230_set_hw_addr_filt(struct ieee802154_hw *hw,
 }
 
 static int
-at86rf230_set_txpower(struct ieee802154_hw *hw, int db)
+at86rf230_set_txpower(struct ieee802154_hw *hw, s8 db)
 {
 	struct at86rf230_local *lp = hw->priv;
 
diff --git a/include/net/mac802154.h b/include/net/mac802154.h
index 2f0644c0612a..e18e7fd43f47 100644
--- a/include/net/mac802154.h
+++ b/include/net/mac802154.h
@@ -213,7 +213,7 @@ struct ieee802154_ops {
 	int		(*set_hw_addr_filt)(struct ieee802154_hw *hw,
 					    struct ieee802154_hw_addr_filt *filt,
 					    unsigned long changed);
-	int		(*set_txpower)(struct ieee802154_hw *hw, int db);
+	int		(*set_txpower)(struct ieee802154_hw *hw, s8 dbm);
 	int		(*set_lbt)(struct ieee802154_hw *hw, bool on);
 	int		(*set_cca_mode)(struct ieee802154_hw *hw,
 					const struct wpan_phy_cca *cca);