diff --git a/src/gc/gc_ms.c b/src/gc/gc_ms.c
index cc9aac2..aee7122 100644
--- a/src/gc/gc_ms.c
+++ b/src/gc/gc_ms.c
@@ -1537,8 +1537,8 @@ gc_ms_more_traceable_objects(PARROT_INTERP,
         pool->skip = GC_NO_SKIP;
     else if (pool->skip == GC_NEVER_SKIP
          || (pool->skip == GC_NO_SKIP
-         && (new_mem > (mem_pools->mem_used_last_collect >> 1)
-         &&  mem_pools->header_allocs_since_last_collect >= GC_SIZE_THRESHOLD)))
+         &&  new_mem > (mem_pools->mem_used_last_collect >> 1)
+         &&  new_mem >= GC_SIZE_THRESHOLD))
             Parrot_gc_mark_and_sweep(interp, GC_trace_stack_FLAG);
 
     /* requires that num_free_objects be updated in Parrot_gc_mark_and_sweep.