diff --git a/shallow.c b/shallow.c
index 2ba29a5ef5..f1518ce61a 100644
--- a/shallow.c
+++ b/shallow.c
@@ -10,7 +10,6 @@
 #include "diff.h"
 #include "revision.h"
 #include "commit-slab.h"
-#include "sigchain.h"
 
 static int is_shallow = -1;
 static struct stat_validity shallow_stat;