diff --git a/ortools/flatzinc/fz.cc b/ortools/flatzinc/fz.cc
index ff67a003c7..6219e31fe6 100644
--- a/ortools/flatzinc/fz.cc
+++ b/ortools/flatzinc/fz.cc
@@ -27,6 +27,8 @@
 #include <vector>
 
 #include "absl/flags/flag.h"
+#include "absl/flags/parse.h"
+#include "absl/flags/usage.h"
 #include "absl/log/check.h"
 #include "absl/log/flags.h"
 #include "absl/log/initialize.h"