1 files changed, 5 insertions, 1 deletions
diff --git a/winsup/cygwin/perprocess.h b/winsup/cygwin/perprocess.h
index c0a555983..13cf17716 100644
--- a/winsup/cygwin/perprocess.h
+++ b/winsup/cygwin/perprocess.h
@@ -1,6 +1,6 @@
 /* per_process.h: main Cygwin header file.
 
-   Copyright 2000, 2001 Red Hat, Inc.
+   Copyright 2000, 2001, 2013 Red Hat, Inc.
 
 This file is part of Cygwin.
 
@@ -21,7 +21,11 @@ extern struct per_process __cygwin_user_data;
 /* We use the following to test that sizeof hasn't changed.  When adding
    or deleting members, insert fillers or use the reserved entries.
    Do not change this value. */
+#ifdef __x86_64__
+#define SIZEOF_PER_PROCESS (41 * 8)
+#else
 #define SIZEOF_PER_PROCESS (42 * 4)
+#endif
 
 #ifdef __cplusplus
 }