diff --git a/lib/determine-basal/determine-basal.js b/lib/determine-basal/determine-basal.js
index 5e3ee78b8..9ada05bbf 100644
--- a/lib/determine-basal/determine-basal.js
+++ b/lib/determine-basal/determine-basal.js
@@ -184,7 +184,12 @@ var determine_basal = function determine_basal(glucose_status, currenttemp, iob_
         }
     }
 
-    if (minAgo > 12 || minAgo < -5) { // Dexcom data is too old, or way in the future
+    var lastTempAge = 0;
+    if (typeof iob_data.lastTemp !== 'undefined' ) {
+        lastTempAge = round(( new Date(systemTime).getTime() - iob_data.lastTemp.date ) / 60000); // in minutes
+    }
+
+    if ((minAgo > 12 || minAgo < -5) && lastTempAge >= 10) { // Dexcom data is too old, or way in the future
         rT.reason = "If current system time "+systemTime+" is correct, then BG data is too old. The last BG data was read "+minAgo+"m ago at "+bgTime;
     // if BG is too old/noisy, or is changing less than 1 mg/dL/5m for 45m, cancel any high temps and shorten any long zero temps
     } else if ( tooflat ) {
@@ -195,7 +200,7 @@ var determine_basal = function determine_basal(glucose_status, currenttemp, iob_
         }
     }
 // Then, for all such error conditions, cancel any running high temp or shorten any long zero temp, and return.
-    if (bg <= 10 || bg === 38 || noise >= 3 || minAgo > 12 || minAgo < -5 || tooflat ) {
+    if (bg <= 10 || bg === 38 || noise >= 3 || ((minAgo > 12 || minAgo < -5) && lastTempAge >= 10) || tooflat ) {
         if (currenttemp.rate > basal) { // high temp is running
             rT.reason += ". Replacing high temp basal of "+currenttemp.rate+" with neutral temp of "+basal;
             rT.deliverAt = deliverAt;