diff --git a/external/builder/test-fixtures.js b/external/builder/test-fixtures.js
index 53c0cd8b6..12fc8af89 100644
--- a/external/builder/test-fixtures.js
+++ b/external/builder/test-fixtures.js
@@ -30,6 +30,8 @@ ls('*-expected.*').forEach(function(expectationFilename) {
     out = ('Error: ' + e.message).replace(/^/gm, '//');
   }
   if (out !== expectation) {
+    errors++;
+
     echo('Assertion failed for ' + inFilename);
     echo('--------------------------------------------------');
     echo('EXPECTED:');
diff --git a/external/builder/test-fixtures_esprima.js b/external/builder/test-fixtures_esprima.js
index aac26bd50..108d9a35a 100644
--- a/external/builder/test-fixtures_esprima.js
+++ b/external/builder/test-fixtures_esprima.js
@@ -33,6 +33,8 @@ ls('*-expected.*').forEach(function(expectationFilename) {
     out = ('Error: ' + e.message).replace(/^/gm, '//');
   }
   if (out !== expectation) {
+    errors++;
+
     echo('Assertion failed for ' + inFilename);
     echo('--------------------------------------------------');
     echo('EXPECTED:');