diff --git a/README.md b/README.md
index 77d7c5e..66eaee5 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,7 @@ Default:
     root_value: 16,
     unit_precision: 5,
     prop_white_list: ['font', 'font-size', 'line-height', 'letter-spacing'],
+    selector_black_list: [],
     replace: true,
     media_query: false
 }
@@ -45,6 +46,7 @@ Default:
 - `root_value` (Number) The root element font size.
 - `unit_precision` (Number) The decimal numbers to allow the REM units to grow to.
 - `prop_white_list` (Array) The properties that can change from px to rem.
+- `selector_black_list` (Array) The selectors to ignore and leave as px.
 - `replace` (Boolean) replaces rules containing rems instead of adding fallbacks.
 - `media_query` (Boolean) Allow px to be converted in media queries.
 
diff --git a/index.js b/index.js
index e2b4c02..1ba310d 100644
--- a/index.js
+++ b/index.js
@@ -9,6 +9,7 @@ module.exports = postcss.plugin('postcss-pxtorem', function (options) {
         options = options || {};
         var rootValue = options.root_value || 16;
         var unitPrecision = options.unit_precision || 5;
+        var selectorBlackList = options.selector_black_list || [];
         var propWhiteList = options.prop_white_list || ['font', 'font-size', 'line-height', 'letter-spacing'];
         var replace = (options.replace === false) ? false : true;
         var mediaQuery = options.media_query || false;
@@ -22,6 +23,8 @@ module.exports = postcss.plugin('postcss-pxtorem', function (options) {
         css.eachDecl(function (decl, i) {
             if (propWhiteList.indexOf(decl.prop) === -1) return;
 
+            if (blacklistedSelector(selectorBlackList, decl.parent.selector)) return;
+
             var rule = decl.parent;
             var value = decl.value;
 
@@ -63,3 +66,9 @@ function remExists(decls, prop, value) {
         return (decl.prop === prop && decl.value === value);
     });
 }
+
+function blacklistedSelector(blacklist, selector) {
+    return blacklist.some(function (regex) {
+        return selector.match(regex);
+    });
+}
diff --git a/package.json b/package.json
index 699911a..99fb31c 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "postcss-pxtorem",
   "description": "A CSS post-processor that converts px to rem.",
-  "version": "2.1.0",
+  "version": "2.2.0",
   "author": "cuth",
   "license": "MIT",
   "repository": {
diff --git a/spec/pxtorem-spec.js b/spec/pxtorem-spec.js
index 1349b0c..9d0e6fd 100644
--- a/spec/pxtorem-spec.js
+++ b/spec/pxtorem-spec.js
@@ -49,6 +49,17 @@ describe('pxtorem', function () {
         expect(processed).toBe(expected);
     });
 
+    it('should ignore selectors in the selector black list', function () {
+        var rules = '.rule { font-size: 15px } .rule2 { font-size: 15px }';
+        var expected = '.rule { font-size: 0.9375rem } .rule2 { font-size: 15px }';
+        var options = {
+            selector_black_list: ['.rule2']
+        };
+        var processed = postcss(pxtorem(options)).process(rules).css;
+
+        expect(processed).toBe(expected);
+    });
+
     it('should leave fallback pixel unit with root em value', function () {
         var options = {
             replace: false