diff --git a/src/delta-apply.c b/src/delta-apply.c
index f92446126..4852017de 100644
--- a/src/delta-apply.c
+++ b/src/delta-apply.c
@@ -1,5 +1,6 @@
 #include "common.h"
 #include "git/odb.h"
+#include "delta-apply.h"
 
 /*
  * This file was heavily cribbed from BinaryDelta.java in JGit, which