diff --git a/include/cpptrace/cpptrace.hpp b/include/cpptrace/cpptrace.hpp
index 200b2e4..b492381 100644
--- a/include/cpptrace/cpptrace.hpp
+++ b/include/cpptrace/cpptrace.hpp
@@ -4,7 +4,7 @@
 #include <cstdint>
 #include <exception>
 #include <limits>
-#include <ostream>
+#include <iosfwd>
 #include <string>
 #include <system_error>
 #include <type_traits>