diff --git a/include/fmt/core.h b/include/fmt/core.h
index c946e12a64a8..bdf51a4add74 100644
--- a/include/fmt/core.h
+++ b/include/fmt/core.h
@@ -601,7 +601,8 @@ struct error_handler {
   constexpr error_handler(const error_handler&) = default;
 
   // This function is intentionally not constexpr to give a compile-time error.
-  void on_error(const char* message) { throw_format_error(message); }
+  // This function is marked as FMT_API for backwards compatibility, see #2695.
+  FMT_NORETURN FMT_API void on_error(const char* message) { throw_format_error(message); }
 };
 FMT_END_DETAIL_NAMESPACE