diff --git a/src/vm-limit.c b/src/vm-limit.c
index ca7ac4f..78fa702 100644
--- a/src/vm-limit.c
+++ b/src/vm-limit.c
@@ -292,7 +292,7 @@ memory_warnings (POINTER start, void (*warnfun) (const char *))
   else
     data_space_start = start_of_data ();
 
-  warn_function = warnfun;
+  warn_function = NULL;
   __after_morecore_hook = check_memory_limits;
 
   /* Force data limit to be recalculated on each run.  */