diff --git a/tests/intense/main.cpp b/tests/intense/main.cpp
index b2b2a6cb..5e9a5fd2 100644
--- a/tests/intense/main.cpp
+++ b/tests/intense/main.cpp
@@ -27,6 +27,7 @@
 #include <boost/test/unit_test.hpp>
 
 #include <cstdlib>
+#include <iostream>
 
 struct GlobalInitializationFixture {
     GlobalInitializationFixture() {
diff --git a/tests/peerplays_sidechain/peerplays_sidechain_tests.cpp b/tests/peerplays_sidechain/peerplays_sidechain_tests.cpp
index ca2de270..7a7f9f9a 100644
--- a/tests/peerplays_sidechain/peerplays_sidechain_tests.cpp
+++ b/tests/peerplays_sidechain/peerplays_sidechain_tests.cpp
@@ -2,6 +2,8 @@
 
 #include <boost/test/unit_test.hpp>
 
+#include <iostream>
+
 BOOST_AUTO_TEST_CASE(peerplays_sidechain) {
 }