diff --git a/.README/rules/require-indexer-name.md b/.README/rules/require-indexer-name.md
index 220713c2..c09e5347 100644
--- a/.README/rules/require-indexer-name.md
+++ b/.README/rules/require-indexer-name.md
@@ -1,5 +1,7 @@
 ### `require-indexer-name`
 
+_The `--fix` option on the command line automatically fixes problems reported by this rule._
+
 This rule validates Flow object indexer name.
 
 #### Options
diff --git a/src/rules/requireIndexerName.js b/src/rules/requireIndexerName.js
index 8a872866..43ee1f02 100644
--- a/src/rules/requireIndexerName.js
+++ b/src/rules/requireIndexerName.js
@@ -14,8 +14,12 @@ const create = (context) => {
     return {
       ObjectTypeIndexer (node) {
         const id = getParameterName(node, context);
+        const rawKeyType = context.getSourceCode().getText(node.key);
         if (id === null) {
           context.report({
+            fix (fixer) {
+              return fixer.replaceText(node.key, 'key: ' + rawKeyType);
+            },
             message: 'All indexers must be declared with key name.',
             node,
           });