diff --git a/src/js/util.js b/src/js/util.js
index 03eba0d..a016ad4 100644
--- a/src/js/util.js
+++ b/src/js/util.js
@@ -95,28 +95,26 @@ exports.sanitize = function (jsString) {
     while (i < jsString.length && c !== quote) {
       if (c === '"' && prev() !== '\\') {
         // unescaped double quote, escape it
-        chars.push('\\');
+        chars.push('\\"');
       }
-
-      // replace unescaped control characters with escaped ones
-      if (controlChars.hasOwnProperty(c)) {
+      else if (controlChars.hasOwnProperty(c)) {
+        // replace unescaped control characters with escaped ones
         chars.push(controlChars[c])
-        i++;
-        c = curr();
       }
-
-      // handle escape character
-      if (c === '\\') {
+      else if (c === '\\') {
+        // remove the escape character when followed by a single quote ', not needed
         i++;
         c = curr();
-
-        // remove the escape character when followed by a single quote ', not needed
         if (c !== '\'') {
           chars.push('\\');
         }
+        chars.push(c);
+      }
+      else {
+        // regular character
+        chars.push(c);
       }
 
-      chars.push(c);
       i++;
       c = curr();
     }
diff --git a/test/util.test.js b/test/util.test.js
index 8304618..24272bc 100644
--- a/test/util.test.js
+++ b/test/util.test.js
@@ -30,6 +30,15 @@ describe('util', function () {
       assert.equal(util.sanitize('"foo\\\'bar"'), '"foo\'bar"');
     });
 
+    it('should escape unescaped control characters', function () {
+      assert.equal(util.sanitize('"hello\bworld"'), '"hello\\bworld"')
+      assert.equal(util.sanitize('"hello\fworld"'), '"hello\\fworld"')
+      assert.equal(util.sanitize('"hello\nworld"'), '"hello\\nworld"')
+      assert.equal(util.sanitize('"hello\rworld"'), '"hello\\rworld"')
+      assert.equal(util.sanitize('"hello\tworld"'), '"hello\\tworld"')
+      assert.equal(util.sanitize('{"value\n": "dc=hcm,dc=com"}'), '{"value\\n": "dc=hcm,dc=com"}')
+    })
+
     it('remove comments', function () {
       assert.equal(util.sanitize('/* foo */ {}'), ' {}');
       assert.equal(util.sanitize('/* foo */ {}'), ' {}');