diff --git a/internal/catch_stream.hpp b/internal/catch_stream.hpp
index 414d9737..a70f0e58 100644
--- a/internal/catch_stream.hpp
+++ b/internal/catch_stream.hpp
@@ -14,6 +14,7 @@
 #define TWOBLUECUBES_CATCH_STREAM_HPP_INCLUDED
 
 #include <stdexcept>
+#include <cstdio>
 
 namespace Catch
 {