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
diff --git a/spin/spin.d.ts b/spin/spin.d.ts
index f48adbb5ef..becf2f58e3 100644
--- a/spin/spin.d.ts
+++ b/spin/spin.d.ts
@@ -15,8 +15,8 @@ interface SpinnerOptions {
     color?: string; // #rgb or #rrggbb
     speed?: number; // Rounds per second
     trail?: number; // Afterglow percentage
-    shadow?: bool; // Whether to render a shadow
-    hwaccel?: bool; // Whether to use hardware acceleration
+    shadow?: boolean; // Whether to render a shadow
+    hwaccel?: boolean; // Whether to use hardware acceleration
     className?: string; // The CSS class to assign to the spinner
     zIndex?: number; // The z-index (defaults to 2000000000)
     top?: string; // Top position relative to parent in px
@@ -30,4 +30,4 @@ declare class Spinner {
     stop();
     lines(el, o);
     opacity(el, i, val);
-}
+}