1 files changed, 3 insertions, 1 deletions
diff --git a/diff.h b/diff.h
index 5a0c91bb48..2102df329a 100644
--- a/diff.h
+++ b/diff.h
@@ -4,10 +4,12 @@
 #ifndef DIFF_H
 #define DIFF_H
 
+#include "hash-ll.h"
 #include "pathspec.h"
-#include "oidset.h"
 #include "strbuf.h"
 
+struct oidset;
+
 /**
  * The diff API is for programs that compare two sets of files (e.g. two trees,
  * one tree and the index) and present the found difference in various ways.