diff --git a/modules/exstats.js b/modules/exstats.js
index ec0a838a7..b22f3f5d3 100644
--- a/modules/exstats.js
+++ b/modules/exstats.js
@@ -135,7 +135,7 @@ Bangle.on("GPS", function(fix) {
   if (stats["dist"]) stats["dist"].emit("changed",stats["dist"]);
   var duration = Date.now() - state.startTime; // in ms
   state.avrSpeed = state.distance * 1000 / duration; // meters/sec
-  state.curSpeed = state.curSpeed*0.8 + fix.speed*0.2/3.6; // meters/sec
+  if (!isNaN(fix.speed)) state.curSpeed = state.curSpeed*0.8 + fix.speed*0.2/3.6; // meters/sec
   if (stats["pacea"]) stats["pacea"].emit("changed",stats["pacea"]);
   if (stats["pacec"]) stats["pacec"].emit("changed",stats["pacec"]);
   if (stats["speed"]) stats["speed"].emit("changed",stats["speed"]);