diff --git a/index.js b/index.js
index 343d80e7..57f2781a 100644
--- a/index.js
+++ b/index.js
@@ -114,7 +114,7 @@ function createHarness (conf_) {
         function onend () {
             count--;
             if (this._progeny.length) {
-                var unshifts = this._progeny.map(function (st) {
+                var unshifts = map(this._progeny, function (st) {
                     return function () {
                         running = true;
                         out.push(st);
@@ -152,4 +152,13 @@ function createHarness (conf_) {
     return test;
 }
 
+function map (xs, f) {
+    if (xs.map) return xs.map(f);
+    var res = [];
+    for (var i = 0; i < xs.length; i++) {
+        res.push(f(xs[i]));
+    }
+    return res;
+}
+
 // vim: set softtabstop=4 shiftwidth=4:
diff --git a/package.json b/package.json
index ac33d1e3..04e4f57f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name" : "tape",
-    "version" : "0.3.2",
+    "version" : "0.3.3",
     "description" : "tap-producing test harness for node and browsers",
     "main" : "index.js",
     "bin" : "./bin/tape",