diff --git a/keystore/keystore_cli_v2.cpp b/keystore/keystore_cli_v2.cpp
index 1cfb4f6..1e9126d 100644
--- a/keystore/keystore_cli_v2.cpp
+++ b/keystore/keystore_cli_v2.cpp
@@ -19,6 +19,7 @@
 #include <iostream>
 #include <memory>
 #include <string>
+#include <variant>
 #include <vector>
 
 #include <base/command_line.h>