diff --git a/include/exdisp.idl b/include/exdisp.idl
index b665ce388fa..90cc2662556 100644
--- a/include/exdisp.idl
+++ b/include/exdisp.idl
@@ -64,14 +64,35 @@ interface IWebBrowser : IDispatch
 {
     typedef enum BrowserNavConstants
     {
-        navOpenInNewWindow   = 0x1,
-        navNoHistory         = 0x2,
-        navNoReadFromCache   = 0x4,
-        navNoWriteToCache    = 0x8,
-        navAllowAutosearch   = 0x10,
-        navBrowserBar        = 0x20,
-        navHyperlink         = 0x40,
-        navEnforceRestricted = 0x80
+        navOpenInNewWindow          = 0x00000001,
+        navNoHistory                = 0x00000002,
+        navNoReadFromCache          = 0x00000004,
+        navNoWriteToCache           = 0x00000008,
+        navAllowAutosearch          = 0x00000010,
+        navBrowserBar               = 0x00000020,
+        navHyperlink                = 0x00000040,
+        navEnforceRestricted        = 0x00000080,
+        navNewWindowsManaged        = 0x00000100,
+        navUntrustedForDownload     = 0x00000200,
+        navTrustedForActiveX        = 0x00000400,
+        navOpenInNewTab             = 0x00000800,
+        navOpenInBackgroundTab      = 0x00001000,
+        navKeepWordWheelText        = 0x00002000,
+        navVirtualTab               = 0x00004000,
+        navBlockRedirectsXDomain    = 0x00008000,
+        navOpenNewForegroundTab     = 0x00010000,
+        navTravelLogScreenshot      = 0x00020000,
+        navDeferUnload              = 0x00040000,
+        navSpeculative              = 0x00080000,
+        navSuggestNewWindow         = 0x00100000,
+        navSuggestNewTab            = 0x00200000,
+        navReserved1                = 0x00400000,
+        navHomepageNavigate         = 0x00800000,
+        navRefresh                  = 0x01000000,
+        navHostNavigation           = 0x02000000,
+        navReserved2                = 0x04000000,
+        navReserved3                = 0x08000000,
+        navReserved4                = 0x10000000,
     } BrowserNavConstants;
 
     typedef enum RefreshConstants