diff --git a/include/pcg_random.hpp b/include/pcg_random.hpp
index 3f04d85..c04c115 100644
--- a/include/pcg_random.hpp
+++ b/include/pcg_random.hpp
@@ -81,7 +81,7 @@
 #include <cstring>
 #include <cassert>
 #include <limits>
-#include <iostream>
+#include <iosfwd>
 #include <type_traits>
 #include <utility>
 #include <locale>