diff --git a/sys/dev/ath/ath_hal/ar5212/ar5212_ani.c b/sys/dev/ath/ath_hal/ar5212/ar5212_ani.c
index 4d4087012012..4e2cd683df8c 100644
--- a/sys/dev/ath/ath_hal/ar5212/ar5212_ani.c
+++ b/sys/dev/ath/ath_hal/ar5212/ar5212_ani.c
@@ -1000,6 +1000,9 @@ ar5212AniPoll(struct ath_hal *ah, const struct ieee80211_channel *chan)
 		ahp->ah_stats.ast_ani_lneg++;
 		/* restart ANI period if listenTime is invalid */
 		ar5212AniRestart(ah, aniState);
+
+		/* Don't do any further ANI processing here */
+		return;
 	}
 	/* XXX beware of overflow? */
 	aniState->listenTime += listenTime;
diff --git a/sys/dev/ath/ath_hal/ar5416/ar5416_ani.c b/sys/dev/ath/ath_hal/ar5416/ar5416_ani.c
index 54f1293d9622..a10d884aaaf8 100644
--- a/sys/dev/ath/ath_hal/ar5416/ar5416_ani.c
+++ b/sys/dev/ath/ath_hal/ar5416/ar5416_ani.c
@@ -950,6 +950,9 @@ ar5416AniPoll(struct ath_hal *ah, const struct ieee80211_channel *chan)
 		HALDEBUG(ah, HAL_DEBUG_ANI, "%s: invalid listenTime\n",
 		    __func__);
 		ar5416AniRestart(ah, aniState);
+
+		/* Don't do any further processing */
+		return;
 	}
 	/* XXX beware of overflow? */
 	aniState->listenTime += listenTime;