diff --git a/lodash/lodash-tests.ts b/lodash/lodash-tests.ts
index 2d244b16e..f493b4260 100644
--- a/lodash/lodash-tests.ts
+++ b/lodash/lodash-tests.ts
@@ -5635,18 +5635,34 @@ result = <boolean>_<any>([]).isPlainObject();
 result = <boolean>_({}).isPlainObject();
 
 // _.isRegExp
-result = <boolean>_.isRegExp(any);
-result = <boolean>_(1).isRegExp();
-result = <boolean>_<any>([]).isRegExp();
-result = <boolean>_({}).isRegExp();
-{
-  let value: RegExp|string = /^foo$/g;
-  if (_.isRegExp(value)) {
-    let regex: RegExp = value;
-    let index: number = value.exec("foo").index;
-  } else {
-    let result: string = value;
-  }
+module TestIsRegExp {
+    {
+        let value: number|RegExp;
+
+        if (_.isRegExp(value)) {
+            let result: RegExp = value;
+        }
+        else {
+            let result: number = value;
+        }
+    }
+
+    {
+        let result: boolean;
+
+        result = _.isRegExp(any);
+        result = _(1).isRegExp();
+        result = _<any>([]).isRegExp();
+        result = _({}).isRegExp();
+    }
+
+    {
+        let result: _.LoDashExplicitWrapper<boolean>;
+
+        result = _(1).chain().isRegExp();
+        result = _<any>([]).chain().isRegExp();
+        result = _({}).chain().isRegExp();
+    }
 }
 
 // _.isString
diff --git a/lodash/lodash.d.ts b/lodash/lodash.d.ts
index 8425f1d82..350757ded 100644
--- a/lodash/lodash.d.ts
+++ b/lodash/lodash.d.ts
@@ -9605,6 +9605,7 @@ declare module _ {
         /**
          * Checks if value is classified as a RegExp object.
          * @param value The value to check.
+         *
          * @return Returns true if value is correctly classified, else false.
          */
         isRegExp(value?: any): value is RegExp;
@@ -9617,6 +9618,13 @@ declare module _ {
         isRegExp(): boolean;
     }
 
+    interface LoDashExplicitWrapperBase<T, TWrapper> {
+        /**
+         * see _.isRegExp
+         */
+        isRegExp(): LoDashExplicitWrapper<boolean>;
+    }
+
     //_.isString
     interface LoDashStatic {
         /**