diff --git a/lazy.js/lazy.js-tests.ts b/lazy.js/lazy.js-tests.ts
index 59331377c..7689bcaf7 100644
--- a/lazy.js/lazy.js-tests.ts
+++ b/lazy.js/lazy.js-tests.ts
@@ -27,6 +27,7 @@ var fooObjectSeq: LazyJS.ObjectLikeSequence<Foo>;
 var anyObjectSeq: LazyJS.ObjectLikeSequence<any>;
 var fooAsyncSeq: LazyJS.AsyncSequence<Foo>;
 
+var strSequence: LazyJS.Sequence<string>;
 var stringSeq: LazyJS.StringLikeSequence;
 
 var obj: Object;
@@ -124,7 +125,7 @@ foo = fooSequence.last();
 fooSequence = fooSequence.last(num);
 
 fooSequence = fooSequence.lastIndexOf(foo);
-fooSequence = fooSequence.map(fnMapCallback);
+barSequence = fooSequence.map(fnMapCallback);
 foo = fooSequence.max();
 foo = fooSequence.max(fnNumberCallback);
 foo = fooSequence.min();
@@ -175,7 +176,7 @@ fooObjectSeq = fooObjectSeq.defaults(obj);
 fooSequence = fooObjectSeq.functions();
 fooObjectSeq = fooObjectSeq.get(str);
 fooObjectSeq = fooObjectSeq.invert();
-stringSeq = fooObjectSeq.keys();
+strSequence = fooObjectSeq.keys();
 fooObjectSeq = fooObjectSeq.omit(strArr);
 fooSequence = fooObjectSeq.pairs();
 fooObjectSeq = fooObjectSeq.pick(strArr);
diff --git a/lazy.js/lazy.js.d.ts b/lazy.js/lazy.js.d.ts
index 53de92ae3..ca19aed98 100644
--- a/lazy.js/lazy.js.d.ts
+++ b/lazy.js/lazy.js.d.ts
@@ -6,8 +6,8 @@
 declare module LazyJS {
 
 	interface LazyStatic {
-		(value: string):StringLikeSequence;
 
+		(value: string):StringLikeSequence;
 		<T>(value: T[]):ArrayLikeSequence<T>;
 		(value: any[]):ArrayLikeSequence<any>;
 		<T>(value: Object):ObjectLikeSequence<T>;
@@ -141,7 +141,7 @@ declare module LazyJS {
 		invoke(methodName: string): Sequence<T>;
 		isEmpty(): boolean;
 		join(delimiter?: string): string;
-		map<U>(mapFn: MapCallback<T, U>): Sequence<T>;
+		map<U>(mapFn: MapCallback<T, U>): Sequence<U>;
 
 		max(valueFn?: NumberCallback<T>): T;
 		min(valueFn?: NumberCallback<T>): T;
@@ -200,7 +200,7 @@ declare module LazyJS {
 		functions(): Sequence<T>;
 		get(property: string): ObjectLikeSequence<T>;
 		invert(): ObjectLikeSequence<T>;
-		keys(): StringLikeSequence;
+		keys(): Sequence<string>;
 		omit(properties: string[]): ObjectLikeSequence<T>;
 		pairs(): Sequence<T>;
 		pick(properties: string[]): ObjectLikeSequence<T>;