diff --git a/fmt/format.h b/fmt/format.h
index 4ba63b58..0073c4e7 100644
--- a/fmt/format.h
+++ b/fmt/format.h
@@ -2405,6 +2405,7 @@ class SystemError : public internal::RuntimeError {
   SystemError(int error_code, CStringRef message) {
     init(error_code, message, ArgList());
   }
+  SystemError(const SystemError&) = default;
   FMT_VARIADIC_CTOR(SystemError, init, int, CStringRef)
 
   FMT_API ~SystemError() FMT_DTOR_NOEXCEPT;