diff --git a/src/CryptoNoteCore/SwappedMap.h b/src/CryptoNoteCore/SwappedMap.h
index 5c4aca842c..9195cd253c 100644
--- a/src/CryptoNoteCore/SwappedMap.h
+++ b/src/CryptoNoteCore/SwappedMap.h
@@ -5,6 +5,7 @@
 
 #pragma once
 
+#include <iostream>
 #include <cstdint>
 #include <fstream>
 #include <iomanip>