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-rw-r--r--t/helper/test-cache-tree.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/t/helper/test-cache-tree.c b/t/helper/test-cache-tree.c
index 9159a17301..615e648e55 100644
--- a/t/helper/test-cache-tree.c
+++ b/t/helper/test-cache-tree.c
@@ -1,6 +1,7 @@
#define USE_THE_INDEX_VARIABLE
#include "test-tool.h"
#include "cache.h"
+#include "hex.h"
#include "tree.h"
#include "cache-tree.h"
#include "parse-options.h"