diff --git a/lib/rules/sort-prop-types.js b/lib/rules/sort-prop-types.js
index 174ee43c50..90deb23705 100644
--- a/lib/rules/sort-prop-types.js
+++ b/lib/rules/sort-prop-types.js
@@ -166,7 +166,7 @@ module.exports = {
 
     return {
       CallExpression: function(node) {
-        if (!sortShapeProp || !isShapeProp(node) || (!node.arguments && !node.arguments[0])) {
+        if (!sortShapeProp || !isShapeProp(node) || !(node.arguments && node.arguments[0])) {
           return;
         }
         checkSorted(node.arguments[0].properties);