diff --git a/mozilla/xpfe/appshell/public/nsISessionHistory.h b/mozilla/xpfe/appshell/public/nsISessionHistory.h
index 4f94054b265..fa2419fd35a 100644
--- a/mozilla/xpfe/appshell/public/nsISessionHistory.h
+++ b/mozilla/xpfe/appshell/public/nsISessionHistory.h
@@ -43,6 +43,8 @@ class nsIWebShell;
 { 0x68e73d52, 0x12eb, 0x11d3, { 0xbd, 0xc0, 0x0, 0x50, 0x4, 0xa, 0x9b, 0x44 } \
 }
 
+#define LOAD_HISTORY 10
+
 class nsISessionHistory : public nsISupports
 {
 public: