diff --git a/lib/rules/style-prop-object.js b/lib/rules/style-prop-object.js
index da401273b5..7d27fd1755 100644
--- a/lib/rules/style-prop-object.js
+++ b/lib/rules/style-prop-object.js
@@ -35,7 +35,7 @@ module.exports = {
   },
 
   create: function(context) {
-    const allowed = context.options.length > 0 && context.options[0].allow || [];
+    const allowed = context.options.length > 0 && new Set(context.options[0].allow || []);
 
     /**
      * @param {object} node An Identifier node
@@ -72,7 +72,7 @@ module.exports = {
             const componentName = node.arguments[0].name;
 
             // allowed list contains the name
-            if (allowed.indexOf(componentName) > -1) {
+            if (allowed.has(componentName)) {
               // abort operation
               return;
             }