diff --git a/src/compiler/sys.ts b/src/compiler/sys.ts
index 614adf72ab..52e234e824 100644
--- a/src/compiler/sys.ts
+++ b/src/compiler/sys.ts
@@ -51,8 +51,8 @@ namespace ts {
         args: string[];
         currentDirectory: string;
         executingFile: string;
-        newLine?: string;  
-        useCaseSensitiveFileNames?: boolean;  
+        newLine?: string;
+        useCaseSensitiveFileNames?: boolean;
         echo(s: string): void;
         quit(exitCode?: number): void;
         fileExists(path: string): boolean;
@@ -62,8 +62,8 @@ namespace ts {
         readFile(path: string): string;
         writeFile(path: string, contents: string): void;
         readDirectory(path: string, extension?: string, exclude?: string[]): string[];
-        watchFile?(path: string, callback: (path: string, removed?: boolean) => void): FileWatcher;  
-        watchDirectory?(path: string, callback: (path: string) => void, recursive?: boolean): FileWatcher;  
+        watchFile?(path: string, callback: (path: string, removed?: boolean) => void): FileWatcher;
+        watchDirectory?(path: string, callback: (path: string) => void, recursive?: boolean): FileWatcher;
     };
 
     export var sys: System = (function () {