diff --git a/src/index.js b/src/index.js
index 3cbd70c..92b163d 100644
--- a/src/index.js
+++ b/src/index.js
@@ -58,7 +58,8 @@ function gulpCssBase64(opts) {
                     return;
                   }
 
-                  if (opts.extensionsAllowed.length !== 0 && opts.extensionsAllowed.indexOf(path.extname(result[1])) === -1) {
+                  var pureUrl = result[1].split('?')[0].split('#')[0];
+                  if (opts.extensionsAllowed.length !== 0 && opts.extensionsAllowed.indexOf(path.extname(pureUrl)) === -1) {
                     log('Ignores ' + chalk.yellow(result[1]) + ', extension not allowed ' + chalk.yellow(path.extname(result[1])), opts.verbose);
                     callback();
                     return;
diff --git a/test/test.js b/test/test.js
index 85e0346..7970fb3 100644
--- a/test/test.js
+++ b/test/test.js
@@ -115,6 +115,31 @@ describe('gulp-css-base64', function () {
       });
     });
 
+    it('should convert url() content with questionmark at end even if extensionsAllowed is passed', function (done) {
+            // create the fake file
+      var fakeFile = new gutil.File({
+        contents: new Buffer('.button_alert{background:url(\'test/fixtures/image/very-very-small.png?awesomeQuestionmark\') no-repeat 4px 5px;padding-left:12px;font-size:12px;color:#888;text-decoration:underline}')
+      });
+
+            // Create a css-base64 plugin stream
+      var stream = base64({
+        extensionsAllowed: ['.gif', '.jpg', '.png']
+      });
+
+            // write the fake file to it
+      stream.write(fakeFile);
+
+            // wait for the file to come back out
+      stream.once('data', function (file) {
+                // make sure it came out the same way it went in
+        assert(file.isBuffer());
+
+                // check the contents
+        assert.equal(file.contents.toString('utf8'), '.button_alert{background:url(\'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA0AAAANAQAAAABakNnRAAAAAmJLR0QAAKqNIzIAAAAJcEhZcwAAAEgAAABIAEbJaz4AAAArSURBVAjXY/j/g2H/C4b5Jxj6OxgaOEBoxgmGDg8GIACyuRoYjkowfKgAACBpDLQ2kvRRAAAAAElFTkSuQmCC\') no-repeat 4px 5px;padding-left:12px;font-size:12px;color:#888;text-decoration:underline}');
+        done();
+      });
+    });
+
     it('should convert url() content with hashtag at end', function (done) {
             // create the fake file
       var fakeFile = new gutil.File({
@@ -138,6 +163,31 @@ describe('gulp-css-base64', function () {
       });
     });
 
+    it('should convert url() content with hashtag at end even if extensionsAllowed is passed', function (done) {
+            // create the fake file
+      var fakeFile = new gutil.File({
+        contents: new Buffer('.button_alert{background:url(\'test/fixtures/image/very-very-small.png#awesomeHashtag\') no-repeat 4px 5px;padding-left:12px;font-size:12px;color:#888;text-decoration:underline}')
+      });
+
+            // Create a css-base64 plugin stream
+      var stream = base64({
+        extensionsAllowed: ['.gif', '.jpg', '.png']
+      });
+
+            // write the fake file to it
+      stream.write(fakeFile);
+
+            // wait for the file to come back out
+      stream.once('data', function (file) {
+                // make sure it came out the same way it went in
+        assert(file.isBuffer());
+
+                // check the contents
+        assert.equal(file.contents.toString('utf8'), '.button_alert{background:url(\'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA0AAAANAQAAAABakNnRAAAAAmJLR0QAAKqNIzIAAAAJcEhZcwAAAEgAAABIAEbJaz4AAAArSURBVAjXY/j/g2H/C4b5Jxj6OxgaOEBoxgmGDg8GIACyuRoYjkowfKgAACBpDLQ2kvRRAAAAAElFTkSuQmCC\') no-repeat 4px 5px;padding-left:12px;font-size:12px;color:#888;text-decoration:underline}');
+        done();
+      });
+    });
+
     it('should ignore if image weight is greater than maxWeightResource default value', function (done) {
             // create the fake file
       var fakeFile = new gutil.File({