1 files changed, 4 insertions, 3 deletions
diff --git a/packages/react-docs/src/components/interface.tsx b/packages/react-docs/src/components/interface.tsx
index 93b10e96d..cad7d6c46 100644
--- a/packages/react-docs/src/components/interface.tsx
+++ b/packages/react-docs/src/components/interface.tsx
@@ -1,8 +1,9 @@
 import * as _ from 'lodash';
 import * as React from 'react';
 
+import { CustomType, TypeDefinitionByName } from '@0xproject/types';
+
 import { DocsInfo } from '../docs_info';
-import { CustomType, TypeDefinitionByName } from '../types';
 
 import { Signature } from './signature';
 import { Type } from './type';
@@ -19,9 +20,9 @@ export interface InterfaceProps {
 
 export const Interface: React.SFC<InterfaceProps> = (props: InterfaceProps): any => {
     const type = props.type;
-    const properties = _.map(type.children, property => {
+    const properties = _.map(type.children, (property, i) => {
         return (
-            <span key={`property-${property.name}-${property.type}-${type.name}`}>
+            <span key={`property-${property.name}-${property.type}-${type.name}-${i}`}>
                 {property.name}:{' '}
                 {property.type && !_.isUndefined(property.type.method) ? (
                     <Signature