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-rw-r--r--builtin/difftool.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/builtin/difftool.c b/builtin/difftool.c
index 71318c26e1..a3ea60ea71 100644
--- a/builtin/difftool.c
+++ b/builtin/difftool.c
@@ -11,6 +11,7 @@
*
* Copyright (C) 2016 Johannes Schindelin
*/
+#define USE_THE_INDEX_COMPATIBILITY_MACROS
#include "cache.h"
#include "config.h"
#include "builtin.h"