diff --git a/sys/dev/ipw/if_ipw.c b/sys/dev/ipw/if_ipw.c
index 1c4e492f7586..0b217583f241 100644
--- a/sys/dev/ipw/if_ipw.c
+++ b/sys/dev/ipw/if_ipw.c
@@ -2462,6 +2462,9 @@ ipw_config(struct ipw_softc *sc)
 	case IEEE80211_M_MONITOR:
 		data = htole32(IPW_MODE_MONITOR);
 		break;
+	default:
+		device_printf(sc->sc_dev, "unknown opmode %d\n", ic->ic_opmode);
+		return EINVAL;
 	}
 	DPRINTF(("Setting mode to %u\n", le32toh(data)));
 	error = ipw_cmd(sc, IPW_CMD_SET_MODE, &data, sizeof data);
diff --git a/sys/dev/iwi/if_iwi.c b/sys/dev/iwi/if_iwi.c
index a551448c6907..1105425da632 100644
--- a/sys/dev/iwi/if_iwi.c
+++ b/sys/dev/iwi/if_iwi.c
@@ -2208,7 +2208,8 @@ iwi_get_firmware(struct iwi_softc *sc, enum ieee80211_opmode opmode)
 			  &sc->fw_uc, "iwi_ucode_monitor");
 		break;
 	default:
-		break;
+		device_printf(sc->sc_dev, "unknown opmode %d\n", opmode);
+		return EINVAL;
 	}
 	fp = sc->fw_fw.fp;
 	if (fp == NULL) {
diff --git a/sys/dev/iwn/if_iwn.c b/sys/dev/iwn/if_iwn.c
index b520d8d6a907..51dea2236b7d 100644
--- a/sys/dev/iwn/if_iwn.c
+++ b/sys/dev/iwn/if_iwn.c
@@ -3916,7 +3916,8 @@ iwn_config(struct iwn_softc *sc)
 		    IWN_FILTER_CTL | IWN_FILTER_PROMISC);
 		break;
 	default:
-		break;
+		device_printf(sc->sc_dev, "unknown opmode %d\n", ic->ic_opmode);
+		return EINVAL;
 	}
 	sc->config.cck_mask  = 0x0f;	/* not yet negotiated */
 	sc->config.ofdm_mask = 0xff;	/* not yet negotiated */
diff --git a/sys/dev/wpi/if_wpi.c b/sys/dev/wpi/if_wpi.c
index 4378164ac4fe..af51f60269c5 100644
--- a/sys/dev/wpi/if_wpi.c
+++ b/sys/dev/wpi/if_wpi.c
@@ -2818,6 +2818,9 @@ wpi_config(struct wpi_softc *sc)
 		sc->config.filter |= htole32(WPI_FILTER_MULTICAST |
 			WPI_FILTER_CTL | WPI_FILTER_PROMISC);
 		break;
+	default:
+		device_printf(sc->sc_dev, "unknown opmode %d\n", ic->ic_opmode);
+		return EINVAL;
 	}
 	sc->config.cck_mask  = 0x0f;	/* not yet negotiated */
 	sc->config.ofdm_mask = 0xff;	/* not yet negotiated */