1 files changed, 1 insertions, 0 deletions
diff --git a/unwind.c b/unwind.c
index 7d729ee0..ff022756 100644
--- a/unwind.c
+++ b/unwind.c
@@ -475,6 +475,7 @@ void uw_init(void)
   uw_register_subtype(query_error_s, error_s);
   uw_register_subtype(file_error_s, error_s);
   uw_register_subtype(process_error_s, error_s);
+  uw_register_subtype(system_error_s, error_s);
   uw_register_subtype(assert_s, error_s);
   uw_register_subtype(syntax_error_s, error_s);
 }