diff --git a/lib/service-worker.js b/lib/service-worker.js
index d32bafb..267a494 100644
--- a/lib/service-worker.js
+++ b/lib/service-worker.js
@@ -66,7 +66,7 @@ BroccoliServiceWorker.prototype.write = function(readTree, destDir) {
       lines.push("var urlsToPrefetch = [");
       lines.push("    '/',");
       getFilesRecursively(srcDir, [ "**/*" ]).forEach(function (file, idx, array) {
-        lines.push(createArrayLine("    '"+file+"'", idx, array.length));
+        lines.push(createArrayLine('    '+JSON.stringify(file), idx, array.length));
       });
       lines.push("];");
       precacheURLs.forEach(function (file, idx, array) {