diff --git a/leaflet/leaflet_great_circle.html b/leaflet/leaflet_great_circle.html
index a9d4162..7357693 100644
--- a/leaflet/leaflet_great_circle.html
+++ b/leaflet/leaflet_great_circle.html
@@ -158,10 +158,10 @@ <h2>Enter Coordinates</h2>
         //Function to compute the distance between two points using the Haversine formula
         function compute_distance(lat1,lng1,lat2,lng2){
         		//convert inputs to radians
-            rad_lat1 = lat1 * Math.pi()/180;
-            rad_lng1 = lng1 * Math.pi()/180;
-            rad_lat2 = lat2 * Math.pi()/180;
-            rad_lng2 = lng2 * Math.pi()/180;
+            rad_lat1 = lat1 * Math.PI()/180;
+            rad_lng1 = lng1 * Math.PI()/180;
+            rad_lat2 = lat2 * Math.PI()/180;
+            rad_lng2 = lng2 * Math.PI()/180;
             
             //Differences in coordinates
             const dLat = rad_lat2 - rad_lat1;