1 files changed, 1 insertions, 0 deletions

diff --git a/mask.cc b/mask.cc
index 35a24022..33dcf93b 100644
--- a/mask.cc
+++ b/mask.cc
@@ -1,5 +1,6 @@
 #include "mask.h"
 #include "debug.h"
+#include "util.h"
 
 #include <cstdlib>