diff --git a/lib/retry.js b/lib/retry.js
index 5e85e79..6c73b16 100644
--- a/lib/retry.js
+++ b/lib/retry.js
@@ -22,7 +22,9 @@ exports.timeouts = function(options) {
     randomize: false
   };
   for (var key in options) {
-    opts[key] = options[key];
+    if (options[key] !== undefined) {
+      opts[key] = options[key];
+    }
   }
 
   if (opts.minTimeout > opts.maxTimeout) {
diff --git a/test/integration/test-timeouts.js b/test/integration/test-timeouts.js
index 7206b0f..5497d92 100644
--- a/test/integration/test-timeouts.js
+++ b/test/integration/test-timeouts.js
@@ -67,3 +67,24 @@ var retry = require(common.dir.lib + '/retry');
   var timeouts = retry.timeouts({retries: 2});
   assert.strictEqual(timeouts.length, 2);
 })();
+
+(function testUndefinedOptionsKeepDefaults() {
+  var timeouts = retry.timeouts({
+    retries: 3,
+    minTimeout: undefined,
+    maxTimeout: undefined
+  });
+
+  assert.deepEqual(timeouts, [1000, 2000, 4000]);
+})();
+
+(function testUndefinedRetriesKeepsDefaultCount() {
+  var timeouts = retry.timeouts({
+    retries: undefined,
+    minTimeout: 1000
+  });
+
+  assert.equal(timeouts.length, 10);
+  assert.equal(timeouts[0], 1000);
+  assert.equal(timeouts[1], 2000);
+})();