1 files changed, 1 insertions, 0 deletions
diff --git a/apl9.h b/apl9.h
index 8fa539d..69d50b6 100644
--- a/apl9.h
+++ b/apl9.h
@@ -229,6 +229,7 @@ struct DfnFrame
 	ErrorGuard *errorguards; /* a linked list of error handlers */
 	DfnFrame *prev; /* prev in the call stack */
 	DfnFrame *chain; /* prev in the lexical scope */
+	int keep; /* prevents it from being freed */
 };
 
 struct ThreadData