diff --git a/diff.c b/diff.c
index 95488cd..748ab4a 100644
--- a/diff.c
+++ b/diff.c
@@ -4,6 +4,7 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <signal.h>
+#include <limits.h>
 #include "cache.h"
 #include "diff.h"