diff --git a/soc/swr-mstr-ctrl.c b/soc/swr-mstr-ctrl.c
index 57805acddf..543bc7f546 100644
--- a/soc/swr-mstr-ctrl.c
+++ b/soc/swr-mstr-ctrl.c
@@ -1284,7 +1284,7 @@ static void swrm_disable_ports(struct swr_master *master,
 					<< SWRM_DP_PORT_CTRL_OFFSET2_SHFT);
 		value |= ((mport->offset1)
 				<< SWRM_DP_PORT_CTRL_OFFSET1_SHFT);
-		value |= mport->sinterval;
+		value |= (mport->sinterval & 0xFF);
 
 		swr_master_write(swrm,
 				SWRM_DP_PORT_CTRL_BANK((i + 1), bank),