diff --git a/filesystem/filesystem.d.ts b/filesystem/filesystem.d.ts
index 90b159f752..54cf27b1f6 100644
--- a/filesystem/filesystem.d.ts
+++ b/filesystem/filesystem.d.ts
@@ -88,12 +88,12 @@ interface Flags {
     /**
      * Used to indicate that the user wants to create a file or directory if it was not previously there.
      */
-    create?:bool;
+    create?:boolean;
 
     /**
      * By itself, exclusive must have no effect. Used with create, it must cause getFile and getDirectory to fail if the target path already exists.
      */
-    exclusive?:bool;
+    exclusive?:boolean;
 }
 
 /** 
@@ -118,12 +118,12 @@ interface Entry {
     /**
      * Entry is a file.
      */
-    isFile:bool;
+    isFile:boolean;
 
     /**
      * Entry is a directory.
      */
-    isDirectory:bool;
+    isDirectory:boolean;
 
     /**
      * Look up metadata about this entry.
@@ -373,13 +373,13 @@ interface EntrySync{
      * EntrySync is a file.
      * @readonly
      */
-    isFile:bool;
+    isFile:boolean;
 
     /**
      * EntrySync is a directory.
      * @readonly
      */
-    isDirectory:bool;
+    isDirectory:boolean;
 
     /**
      * Look up metadata about this entry.