diff --git a/haversine_02/src/point_types.cpp b/haversine_02/src/point_types.cpp
index f6f105d..05fb53f 100644
--- a/haversine_02/src/point_types.cpp
+++ b/haversine_02/src/point_types.cpp
@@ -41,7 +41,9 @@ void write_pairs_to_json(const PairArray &arr, const char *filename) {
 
     for (u64 i = 0; i < arr.count; ++i) {
       PointPair pair = arr.pairs[i];
-      fprintf(fp, "\t\t{\"x0\": %f, \"y0\": %f, \"x1\": %f, \"y1\": %f}%s\n",
+      fprintf(fp,
+              "\t\t{\"x0\": %.16f, \"y0\": %.16f, \"x1\": %.16f, \"y1\": "
+              "%.16f}%s\n",
               pair.p1.x, pair.p1.y, pair.p2.x, pair.p2.y,
               i + 1 < arr.count ? "," : "");
     }