diff --git a/lib/clientCode.js b/lib/clientCode.js
index 72c6599..c0e78b1 100644
--- a/lib/clientCode.js
+++ b/lib/clientCode.js
@@ -157,7 +157,7 @@ var submitData = function () {
 	if (!$$_l.__send) {
 		$$_l.__send = function (data) {
 			var xhr = (window.ActiveXObject) ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest();
-			xhr.open('POST', '/node-coverage-store');
+			xhr.open('POST', '/node-coverage-store', false);
 			xhr.setRequestHeader('Content-Type', 'application/json');
 			xhr.send(data);
 		};
@@ -183,4 +183,4 @@ exports.generate = composeFile;
 exports.isInstrumented = isInstrumented;
 exports.generateWithHeaderOnly = generateWithHeaderOnly;
 exports.shouldBeExcluded = shouldBeExcluded;
-exports.formatContent = formatContent;
\ No newline at end of file
+exports.formatContent = formatContent;