diff --git a/lodash/lodash-tests.ts b/lodash/lodash-tests.ts
index 81732126c3..3f7a26556d 100644
--- a/lodash/lodash-tests.ts
+++ b/lodash/lodash-tests.ts
@@ -5754,21 +5754,39 @@ result = <boolean>_({}).isArguments();
 }
 
 // _.isArray
-result = <boolean>_.isArray(any);
-result = <boolean>_(1).isArray();
-result = <boolean>_<any>([]).isArray();
-result = <boolean>_({}).isArray();
-{
-  let value: number[]|string = [1, 3, 5];
-  if (_.isArray(value)) {
-    let length: number[] = value.concat(4);
-    // compile error
-    // let char: string = value.charAt(0);
-  } else {
-    let char: string = value.charAt(0);
-    // compile error
-    // let length: number[] = value.concat(4);
-  }
+module TestIsArray {
+    {
+        let value: number|string[]|boolean[];
+
+        if (_.isArray<string>(value)) {
+            let result: string[] = value;
+        }
+        else {
+            if (_.isArray<boolean>(value)) {
+                let result: boolean[] = value;
+            }
+            else {
+                let result: number = value;
+            }
+        }
+    }
+
+    {
+        let result: boolean;
+
+        result = _.isArray(any);
+        result = _(1).isArray();
+        result = _<any>([]).isArray();
+        result = _({}).isArray();
+    }
+
+    {
+        let result: _.LoDashExplicitWrapper<boolean>;
+
+        result = _(1).chain().isArray();
+        result = _<any>([]).chain().isArray();
+        result = _({}).chain().isArray();
+    }
 }
 
 // _.isBoolean
diff --git a/lodash/lodash.d.ts b/lodash/lodash.d.ts
index 2d22f41163..584500c101 100644
--- a/lodash/lodash.d.ts
+++ b/lodash/lodash.d.ts
@@ -9739,9 +9739,10 @@ declare module _ {
         /**
          * Checks if value is classified as an Array object.
          * @param value The value to check.
+         *
          * @return Returns true if value is correctly classified, else false.
-         **/
-        isArray(value?: any): value is any[];
+         */
+        isArray<T>(value?: any): value is T[];
     }
 
     interface LoDashImplicitWrapperBase<T,TWrapper> {
@@ -9751,6 +9752,13 @@ declare module _ {
         isArray(): boolean;
     }
 
+    interface LoDashExplicitWrapperBase<T,TWrapper> {
+        /**
+         * @see _.isArray
+         */
+        isArray(): LoDashExplicitWrapper<boolean>;
+    }
+
     //_.isBoolean
     interface LoDashStatic {
         /**