diff --git a/checkin_notes b/checkin_notes
index 72a5e891c6..f450562fc3 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -10866,3 +10866,9 @@ David  13 Nov 2007
             edit_forum_preferences_action.php
             edit_forum_preferences_forum.php
             lookup_account.php
+
+Rom    13 Nov 2007
+    - Fix build break introduced by new libcurl headers on Windows.
+    
+    lib/
+        boinc_win.h
diff --git a/lib/boinc_win.h b/lib/boinc_win.h
index edd8682e0d..a6f61cbe64 100644
--- a/lib/boinc_win.h
+++ b/lib/boinc_win.h
@@ -81,6 +81,8 @@
 #include <winsock.h>
 #include <wininet.h>
 
+typedef size_t socklen_t;
+
 #else 
 
 /* Under cygwin, curl was probably compiled to use <sys/socket.h> */