diff --git a/src/service/poc_mobile.proto b/src/service/poc_mobile.proto
index 198f3e5d..5aae9dcb 100644
--- a/src/service/poc_mobile.proto
+++ b/src/service/poc_mobile.proto
@@ -219,7 +219,7 @@ message heartbeat {
   uint64 location_validation_timestamp = 10;
   // Distance in meters to the asserted location of the gateway_reward
   // at the time of heartbeat verification
-  uint32 distance_to_asserted = 11;
+  uint64 distance_to_asserted = 11;
 
 }