diff --git a/lib/rules/prop-types.js b/lib/rules/prop-types.js
index 12720d2c63..365c491fc9 100644
--- a/lib/rules/prop-types.js
+++ b/lib/rules/prop-types.js
@@ -276,8 +276,9 @@ module.exports = function(context) {
                 unionTypeDefinition.children = true;
                 return unionTypeDefinition;
               }
-              unionTypeDefinition.children.push(type);
             }
+
+            unionTypeDefinition.children.push(type);
           }
           if (unionTypeDefinition.length === 0) {
             // no complex type found, simply accept everything