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-rw-r--r--diff-tree.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/diff-tree.c b/diff-tree.c
index 868404f..73aa149 100644
--- a/diff-tree.c
+++ b/diff-tree.c
@@ -13,7 +13,7 @@ static int generate_patch = 0;
static int detect_rename = 0;
static int reverse_diff = 0;
static int diff_score_opt = 0;
-static char *pickaxe = 0;
+static const char *pickaxe = NULL;
static const char *header = NULL;
static const char *header_prefix = "";