diff --git a/proguard-project.txt b/proguard-project.txt
index f2fe155..af94546 100644
--- a/proguard-project.txt
+++ b/proguard-project.txt
@@ -18,3 +18,4 @@
 #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
 #   public *;
 #}
+-dontoptimize
\ No newline at end of file
diff --git a/src/edu/mit/media/funf/probe/builtin/WifiProbe.java b/src/edu/mit/media/funf/probe/builtin/WifiProbe.java
index 430ec91..5007be5 100644
--- a/src/edu/mit/media/funf/probe/builtin/WifiProbe.java
+++ b/src/edu/mit/media/funf/probe/builtin/WifiProbe.java
@@ -38,6 +38,8 @@
 import android.util.Log;
 
 import com.google.gson.Gson;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
 
 import edu.mit.media.funf.Schedule;
 import edu.mit.media.funf.probe.Probe.Base;
@@ -52,6 +54,8 @@
 @DisplayName("Nearby Wifi Devices Probe")
 public class WifiProbe extends Base {
 
+    public static final String TSF = "tsf";
+  
 	private static final String LOCK_KEY = WifiProbe.class.getName();
 	
 	private WifiManager wifiManager;
@@ -66,7 +70,12 @@ public void onReceive(Context context, Intent intent) {
 				if (results != null) {
 					Gson gson = getGson();
 					for (ScanResult result : results) {
-						sendData(gson.toJsonTree(result).getAsJsonObject());
+					  JsonObject data = gson.toJsonTree(result).getAsJsonObject();
+					  if (data.has(TIMESTAMP)) {
+					    JsonElement el = data.remove(TIMESTAMP);
+					    data.add(TSF, el);
+					  }
+					  sendData(data);
 					}
 				}
 				if (getState() == State.RUNNING) {