diff --git a/sys/dev/ath/if_athvar.h b/sys/dev/ath/if_athvar.h
index 2931f89e6250..5baa4ebd9401 100644
--- a/sys/dev/ath/if_athvar.h
+++ b/sys/dev/ath/if_athvar.h
@@ -713,7 +713,7 @@ void	ath_intr(void *);
 #define	ath_hal_procradarevent(_ah, _rxs, _fulltsf, _buf, _event) \
 	((*(_ah)->ah_procRadarEvent)((_ah), (_rxs), (_fulltsf), (_buf), (_event)))
 #define	ath_hal_is_fast_clock_enabled(_ah) \
-	((*(_ah)->ah_isFastClockEnabled)((_ah))
+	((*(_ah)->ah_isFastClockEnabled)((_ah)))
 
 #define ath_hal_gpioCfgOutput(_ah, _gpio, _type) \
         ((*(_ah)->ah_gpioCfgOutput)((_ah), (_gpio), (_type)))