diff --git a/lib/svg-to-img.js b/lib/svg-to-img.js
index dff94f9..7d7e975 100644
--- a/lib/svg-to-img.js
+++ b/lib/svg-to-img.js
@@ -20,13 +20,10 @@ module.exports = function (svg, format, out, cb) {
   .background(format === 'jpg' ? '#FFFFFF' : 'none')
   .flatten()
   .stream(format, function (err, stdout, stderr) {
-    if (err) { console.error(err); }
-
-    stdout.on('end', function () {
-      imgCache.set(cacheIndex, [stdout]);
-      cb && cb();
-    });
-
+    if (err) { console.error(err); return; }
+    var chunks = [];
+    stdout.on('data', function(chunk) { chunks.push(chunk); });
+    stdout.on('end', function() { imgCache.set(cacheIndex, chunks); });
     stdout.pipe(out);
   });
 };
@@ -42,9 +39,9 @@ function DataStream(data) {
 util.inherits(DataStream, Readable);
 DataStream.prototype._read = function() {
   while (this.i < this.data.length) {
-    var stop = this.push(this.data[this.i]);
+    var keepPushing = this.push(this.data[this.i]);
     this.i++;
-    if (stop) { return; }
+    if (!keepPushing) { return; }
   }
   this.push(null);
 };