1 files changed, 1 insertions, 1 deletions
diff --git a/diff.c b/diff.c
index 9c38258030..c7cf683e0b 100644
--- a/diff.c
+++ b/diff.c
@@ -825,7 +825,7 @@ static void emit_rewrite_diff(const char *name_a,
 
 struct diff_words_buffer {
 	mmfile_t text;
-	long alloc;
+	unsigned long alloc;
 	struct diff_words_orig {
 		const char *begin, *end;
 	} *orig;