diff --git a/test/emittertests.cpp b/test/emittertests.cpp
index ce2114c..165e05b 100644
--- a/test/emittertests.cpp
+++ b/test/emittertests.cpp
@@ -1,5 +1,6 @@
 #include "tests.h"
 #include "yaml-cpp/yaml.h"
+#include <iostream>
 
 namespace Test
 {
diff --git a/test/new-api/nodetests.cpp b/test/new-api/nodetests.cpp
index 9b9bc2e..a215bac 100644
--- a/test/new-api/nodetests.cpp
+++ b/test/new-api/nodetests.cpp
@@ -1,5 +1,6 @@
 #include "nodetests.h"
 #include "yaml-cpp/yaml.h"
+#include <iostream>
 
 namespace {
 	struct TEST {
diff --git a/test/new-api/spectests.cpp b/test/new-api/spectests.cpp
index 3487c26..328ae7a 100644
--- a/test/new-api/spectests.cpp
+++ b/test/new-api/spectests.cpp
@@ -1,6 +1,7 @@
 #include "spectests.h"
 #include "specexamples.h"
 #include "yaml-cpp/yaml.h"
+#include <iostream>
 
 #define YAML_ASSERT(cond) do { if(!(cond)) return "  Assert failed: " #cond; } while(false)
 
diff --git a/test/old-api/parsertests.cpp b/test/old-api/parsertests.cpp
index bb201f7..3ef4195 100644
--- a/test/old-api/parsertests.cpp
+++ b/test/old-api/parsertests.cpp
@@ -2,6 +2,7 @@
 #include "yaml-cpp/yaml.h"
 #include <sstream>
 #include <algorithm>
+#include <iostream>
 
 namespace Test
 {
diff --git a/test/spectests.cpp b/test/spectests.cpp
index 23c4329..bffc506 100644
--- a/test/spectests.cpp
+++ b/test/spectests.cpp
@@ -1,5 +1,6 @@
 #include "spectests.h"
 #include "yaml-cpp/yaml.h"
+#include <iostream>
 
 namespace Test
 {