diff --git a/app/json-schema-test.cpp b/app/json-schema-test.cpp
index 3c76dec..8eaab9a 100644
--- a/app/json-schema-test.cpp
+++ b/app/json-schema-test.cpp
@@ -27,6 +27,7 @@
 
 #include <fstream>
 #include <regex>
+#include <iostream>
 
 using nlohmann::json;
 using nlohmann::json_uri;
diff --git a/app/json-schema-validate.cpp b/app/json-schema-validate.cpp
index bf0cfdf..055f19b 100644
--- a/app/json-schema-validate.cpp
+++ b/app/json-schema-validate.cpp
@@ -26,6 +26,7 @@
 #include <json-schema.hpp>
 
 #include <fstream>
+#include <iostream>
 
 using nlohmann::json;
 using nlohmann::json_uri;