diff --git a/jquery.cookie/jquery.cookie-tests.ts b/jquery.cookie/jquery.cookie-tests.ts
index 6bf057757d..69a8c04120 100644
--- a/jquery.cookie/jquery.cookie-tests.ts
+++ b/jquery.cookie/jquery.cookie-tests.ts
@@ -15,7 +15,7 @@ class CookieOptions implements JQueryCookieOptions {
     expires: number;
     path: string;
     domain: string;
-    secure: bool;
+    secure: boolean;
 }
 
 $.cookie("the_cookie", "the_value");
diff --git a/jquery.cookie/jquery.cookie.d.ts b/jquery.cookie/jquery.cookie.d.ts
index 3c5f051924..0fc82d8460 100644
--- a/jquery.cookie/jquery.cookie.d.ts
+++ b/jquery.cookie/jquery.cookie.d.ts
@@ -10,12 +10,12 @@ interface JQueryCookieOptions {
     expires?: any;
     path?: string;
     domain?: string;
-    secure?: bool;
+    secure?: boolean;
 }
 
 interface JQueryCookieStatic {
-    raw?: bool;
-    json?: bool;
+    raw?: boolean;
+    json?: boolean;
 
     (name: string): any;
     (name: string, value: string): void;
@@ -27,6 +27,6 @@ interface JQueryCookieStatic {
 interface JQueryStatic {   
     cookie?: JQueryCookieStatic;
 
-    removeCookie(name: string): bool;
-    removeCookie(name: string, options: JQueryCookieOptions): bool;
+    removeCookie(name: string): boolean;
+    removeCookie(name: string, options: JQueryCookieOptions): boolean;
 }
\ No newline at end of file