diff --git a/RX.php b/RX.php
index 077697b..4d0edbe 100644
--- a/RX.php
+++ b/RX.php
@@ -31,7 +31,7 @@ include_once 'classes/geocode.php';
 
 				$result = $db->query('SELECT rowid,* FROM pharmacies');
 				foreach ($result as $row) {
-					$distance = $geo->straight_line_distance($Lat, $Lon, $row['Latitude'], $row['Longitude'], 'N');
+					$distance = $geo->straight_line_distance($Lat, $Lon, $row['Latitude'], $row['Longitude']);
 					if ($distance < $shortest)
 					{
 						$pharmacy  = $row['Pharmacy'];