1 files changed, 1 insertions, 2 deletions
diff --git a/diff.h b/diff.h
index 0cde3b34e2..5c8de79535 100644
--- a/diff.h
+++ b/diff.h
@@ -94,7 +94,7 @@ typedef void (*add_remove_fn_t)(struct diff_options *options,
 typedef void (*diff_format_fn_t)(struct diff_queue_struct *q,
 		struct diff_options *options, void *data);
 
-typedef struct strbuf *(*diff_prefix_fn_t)(struct diff_options *opt, void *data);
+typedef const char *(*diff_prefix_fn_t)(struct diff_options *opt, void *data);
 
 #define DIFF_FORMAT_RAW		0x0001
 #define DIFF_FORMAT_DIFFSTAT	0x0002
@@ -274,7 +274,6 @@ struct diff_options {
 	const char *single_follow;
 	const char *a_prefix, *b_prefix;
 	const char *line_prefix;
-	size_t line_prefix_length;
 
 	/**
 	 * collection of boolean options that affects the operation, but some do