1 files changed, 2 insertions, 0 deletions
diff --git a/brep/types b/brep/types
index 67a32fd..88488c9 100644
--- a/brep/types
+++ b/brep/types
@@ -15,6 +15,7 @@
 #include <ostream>
 #include <functional>    // function, reference_wrapper
 
+#include <ios>           // ios_base::failure
 #include <exception>     // exception
 #include <stdexcept>     // logic_error, invalid_argument, runtime_error
 #include <system_error>
@@ -62,6 +63,7 @@ namespace brep
   using std::invalid_argument;
   using std::runtime_error;
   using std::system_error;
+  using io_error = std::ios_base::failure;
 
   // <butl/optional>
   //