diff --git a/lib/miniprofiler.js b/lib/miniprofiler.js
index 086be80..1e771df 100755
--- a/lib/miniprofiler.js
+++ b/lib/miniprofiler.js
@@ -406,6 +406,10 @@ function describePerformance(root, request) {
 }
 
 function diff(start, stop){
+  if (!stop) {
+    stop = process.hrtime();
+  }
+
   var deltaSecs = stop[0] - start[0];
   var deltaNanoSecs = stop[1] - start[1];