diff --git a/sys/dev/ath/ath_hal/ar9002/ar9285_reset.c b/sys/dev/ath/ath_hal/ar9002/ar9285_reset.c
index 5d07005af93..2adbf2d6d96 100644
--- a/sys/dev/ath/ath_hal/ar9002/ar9285_reset.c
+++ b/sys/dev/ath/ath_hal/ar9002/ar9285_reset.c
@@ -727,7 +727,10 @@ ar9285GetGainBoundariesAndPdadcs(struct ath_hal *ah,
 
         /* Find starting index for this pdGain */
         if (i == 0) {
-            ss = 0; /* for the first pdGain, start from index 0 */
+            if (AR_SREV_MERLIN_20_OR_LATER(ah))
+                ss = (int16_t)(0 - (minPwrT4[i] / 2));
+            else
+                ss = 0; /* for the first pdGain, start from index 0 */
         } else {
 	    /* need overlap entries extrapolated below. */
             ss = (int16_t)((pPdGainBoundaries[i-1] - (minPwrT4[i] / 2)) - tPdGainOverlap + 1 + minDelta);