diff --git a/lodash/lodash-tests.ts b/lodash/lodash-tests.ts
index 1afd48597..af780c051 100644
--- a/lodash/lodash-tests.ts
+++ b/lodash/lodash-tests.ts
@@ -6103,10 +6103,25 @@ module TestIsTypedArray {
 }
 
 // _.isUndefined
-result = <boolean>_.isUndefined(any);
-result = <boolean>_(1).isUndefined();
-result = <boolean>_<any>([]).isUndefined();
-result = <boolean>_({}).isUndefined();
+module TestIsUndefined {
+    {
+        let result: boolean;
+
+        result = _.isUndefined(any);
+
+        result = _(1).isUndefined();
+        result = _<any>([]).isUndefined();
+        result = _({}).isUndefined();
+    }
+
+    {
+        let result: _.LoDashExplicitWrapper<boolean>;
+
+        result = _(1).chain().isUndefined();
+        result = _<any>([]).chain().isUndefined();
+        result = _({}).chain().isUndefined();
+    }
+}
 
 // _.lt
 module TestLt {
diff --git a/lodash/lodash.d.ts b/lodash/lodash.d.ts
index cc5dea119..2e7bab18c 100644
--- a/lodash/lodash.d.ts
+++ b/lodash/lodash.d.ts
@@ -10191,9 +10191,10 @@ declare module _ {
     interface LoDashStatic {
         /**
          * Checks if value is undefined.
+         *
          * @param value The value to check.
          * @return Returns true if value is undefined, else false.
-         **/
+         */
         isUndefined(value: any): boolean;
     }
 
@@ -10204,6 +10205,13 @@ declare module _ {
         isUndefined(): boolean;
     }
 
+    interface LoDashExplicitWrapperBase<T, TWrapper> {
+        /**
+         * see _.isUndefined
+         */
+        isUndefined(): LoDashExplicitWrapper<boolean>;
+    }
+
     //_.lt
     interface LoDashStatic {
         /**