diff --git a/include/qasmtools/parser/position.hpp b/include/qasmtools/parser/position.hpp
index 63e9ebb..9e6f567 100644
--- a/include/qasmtools/parser/position.hpp
+++ b/include/qasmtools/parser/position.hpp
@@ -31,7 +31,7 @@
 #ifndef QASMTOOLS_PARSER_POSITION_HPP_
 #define QASMTOOLS_PARSER_POSITION_HPP_
 
-#include <ostream>
+#include <iostream>
 #include <string>
 
 namespace qasmtools {