diff --git a/lodash/lodash-tests.ts b/lodash/lodash-tests.ts
index 43b95c756..de1331372 100644
--- a/lodash/lodash-tests.ts
+++ b/lodash/lodash-tests.ts
@@ -564,19 +564,38 @@ module TestIndexOf {
     let array: TResult[];
     let list: _.List<TResult>;
     let value: TResult;
-    let result: number;
-    result = _.indexOf<TResult>(array, value);
-    result = _.indexOf<TResult>(array, value, true);
-    result = _.indexOf<TResult>(array, value, 42);
-    result = _.indexOf<TResult>(list, value);
-    result = _.indexOf<TResult>(list, value, true);
-    result = _.indexOf<TResult>(list, value, 42);
-    result = _(array).indexOf(value);
-    result = _(array).indexOf(value, true);
-    result = _(array).indexOf(value, 42);
-    result = _(list).indexOf<TResult>(value);
-    result = _(list).indexOf<TResult>(value, true);
-    result = _(list).indexOf<TResult>(value, 42);
+
+    {
+        let result: number;
+
+        result = _.indexOf<TResult>(array, value);
+        result = _.indexOf<TResult>(array, value, true);
+        result = _.indexOf<TResult>(array, value, 42);
+
+        result = _.indexOf<TResult>(list, value);
+        result = _.indexOf<TResult>(list, value, true);
+        result = _.indexOf<TResult>(list, value, 42);
+
+        result = _(array).indexOf(value);
+        result = _(array).indexOf(value, true);
+        result = _(array).indexOf(value, 42);
+
+        result = _(list).indexOf<TResult>(value);
+        result = _(list).indexOf<TResult>(value, true);
+        result = _(list).indexOf<TResult>(value, 42);
+    }
+
+    {
+        let result: _.LoDashExplicitWrapper<number>;
+
+        result = _(array).chain().indexOf(value);
+        result = _(array).chain().indexOf(value, true);
+        result = _(array).chain().indexOf(value, 42);
+
+        result = _(list).chain().indexOf<TResult>(value);
+        result = _(list).chain().indexOf<TResult>(value, true);
+        result = _(list).chain().indexOf<TResult>(value, 42);
+    }
 }
 
 //_.initial
diff --git a/lodash/lodash.d.ts b/lodash/lodash.d.ts
index 6401f31eb..6050e4ff3 100644
--- a/lodash/lodash.d.ts
+++ b/lodash/lodash.d.ts
@@ -1074,6 +1074,26 @@ declare module _ {
         ): number;
     }
 
+    interface LoDashExplicitArrayWrapper<T> {
+        /**
+         * @see _.indexOf
+         */
+        indexOf(
+            value: T,
+            fromIndex?: boolean|number
+        ): LoDashExplicitWrapper<number>;
+    }
+
+    interface LoDashExplicitObjectWrapper<T> {
+        /**
+         * @see _.indexOf
+         */
+        indexOf<TValue>(
+            value: TValue,
+            fromIndex?: boolean|number
+        ): LoDashExplicitWrapper<number>;
+    }
+
     //_.initial
     interface LoDashStatic {
         /**