diff --git a/bin/exec.js b/bin/exec.js
index c192a98..328b521 100644
--- a/bin/exec.js
+++ b/bin/exec.js
@@ -196,7 +196,9 @@ try {
   istanbulReporter.add('html');
   istanbulReporter.add('lcov');
   istanbulReporter.add('text');
-  istanbulReporter.write(istanbulCollector, true);
+  istanbulReporter.write(istanbulCollector, true, () => {
+    log('Istanbul coverage reports generated');
+  });
 } catch (err) {
   if (config.testing) {
     cleanUp();