diff --git a/lib/rules/property-sort-order.js b/lib/rules/property-sort-order.js
index adbecbf2..854d2025 100644
--- a/lib/rules/property-sort-order.js
+++ b/lib/rules/property-sort-order.js
@@ -104,18 +104,20 @@ module.exports = {
 
       if (block) {
         block.forEach('declaration', function (dec) {
-          var prop = dec.first('property'),
-              name = prop.first('ident');
-
-          if (name) {
-            if (parser.options['ignore-custom-properties']) {
-              if (propertyCheckList.indexOf(name.content) !== -1) {
+          var prop = dec.first('property') || dec.first('customProperty');
+          if (prop) {
+            var name = prop.first('ident');
+
+            if (name) {
+              if (parser.options['ignore-custom-properties']) {
+                if (propertyCheckList.indexOf(name.content) !== -1) {
+                  properties[name.content] = prop;
+                }
+              }
+              else {
                 properties[name.content] = prop;
               }
             }
-            else {
-              properties[name.content] = prop;
-            }
           }
         });