diff --git a/include/Nazara/Core/Thread.hpp b/include/Nazara/Core/Thread.hpp
index bbf82c31b..36655b6bc 100644
--- a/include/Nazara/Core/Thread.hpp
+++ b/include/Nazara/Core/Thread.hpp
@@ -10,7 +10,7 @@
 #include <Nazara/Prerequesites.hpp>
 #include <Nazara/Core/Functor.hpp>
 #include <Nazara/Core/NonCopyable.hpp>
-#include <ostream>
+#include <iosfwd>
 
 class NzThreadImpl;
 
diff --git a/src/Nazara/Core/Thread.cpp b/src/Nazara/Core/Thread.cpp
index 47d7d102d..a25a6546e 100644
--- a/src/Nazara/Core/Thread.cpp
+++ b/src/Nazara/Core/Thread.cpp
@@ -6,6 +6,7 @@
 #include <Nazara/Core/Config.hpp>
 #include <Nazara/Core/Error.hpp>
 #include <Nazara/Core/HardwareInfo.hpp>
+#include <ostream>
 #include <stdexcept>
 
 #if defined(NAZARA_PLATFORM_WINDOWS)