diff --git a/src/zcash/address/unified.h b/src/zcash/address/unified.h
index b59e95be7..c66df239d 100644
--- a/src/zcash/address/unified.h
+++ b/src/zcash/address/unified.h
@@ -10,6 +10,8 @@
 #include "script/script.h"
 #include "zip32.h"
 
+#include <variant>
+
 namespace libzcash {
 
 // prototypes for the classes handling ZIP-316 encoding (in Address.hpp)