diff --git a/test/nodes/core/function/10-function_spec.js b/test/nodes/core/function/10-function_spec.js
index d5d35d77e..d11d67b11 100644
--- a/test/nodes/core/function/10-function_spec.js
+++ b/test/nodes/core/function/10-function_spec.js
@@ -1734,9 +1734,10 @@ describe('function node', function() {
                     msg.delta = Date.now() - msg.payload;
                     receivedMsgs.push(msg)
                     if (receivedMsgs.length === 5) {
-                        var errors = receivedMsgs.filter(msg => msg.delta < timeout_ms)
+                        let deltas = receivedMsgs.map(msg => msg.delta);
+                        var errors = deltas.filter(delta => delta < timeout_ms)
                         if (errors.length > 0) {
-                            done(new Error(`Message received before init completed - was ${msg.delta} expected >${timeout_ms}`))
+                            done(new Error(`Message received before init completed - delta values ${JSON.stringify(deltas)} expected to be > ${timeout_ms}`))
                         } else {
                             done();
                         }