diff --git a/sys/dev/ath/ath_dfs/null/dfs_null.c b/sys/dev/ath/ath_dfs/null/dfs_null.c
index e001a4260d53..a3bae9145856 100644
--- a/sys/dev/ath/ath_dfs/null/dfs_null.c
+++ b/sys/dev/ath/ath_dfs/null/dfs_null.c
@@ -226,13 +226,3 @@ ath_dfs_get_thresholds(struct ath_softc *sc, HAL_PHYERR_PARAM *param)
 	ath_hal_getdfsthresh(sc->sc_ah, param);
 	return 1;
 }
-
-/*
- * Update the current radar patterns based on the
- * current operating mode/regulatory domain.
- */
-int
-ath_dfs_init_radar_filters(struct ath_softc *sc)
-{
-	return 1;
-}
diff --git a/sys/dev/ath/if_athdfs.h b/sys/dev/ath/if_athdfs.h
index 8cc348db37db..a3f27f90e94e 100644
--- a/sys/dev/ath/if_athdfs.h
+++ b/sys/dev/ath/if_athdfs.h
@@ -44,6 +44,5 @@ extern	int ath_dfs_tasklet_needed(struct ath_softc *sc,
 extern	int ath_ioctl_phyerr(struct ath_softc *sc, struct ath_diag *ad);
 extern	int ath_dfs_get_thresholds(struct ath_softc *sc,
     HAL_PHYERR_PARAM *param);
-extern	int ath_dfs_init_radar_filters(struct ath_softc *sc);
 
 #endif	/* __IF_ATHDFS_H__ */