diff --git a/gc.c b/gc.c
index fa6f18e4..9010c4ce 100644
--- a/gc.c
+++ b/gc.c
@@ -325,7 +325,7 @@ size_t gc_sweep(gc_heap *h, size_t *sum_freed_ptr)
       size = gc_heap_align(gc_allocated_bytes(p));
 //fprintf(stdout, "check object %p, size = %d\n", p, size);
       
-#if GC_DEBUG_CONCISE_PRINTFS
+//#if GC_DEBUG_CONCISE_PRINTFS
       // DEBUG
       if (!is_object_type(p))
         fprintf(stderr, "sweep: invalid object at %p", p);
@@ -334,7 +334,7 @@ size_t gc_sweep(gc_heap *h, size_t *sum_freed_ptr)
       if (r && ((char *)p) + size > (char *)r)
         fprintf(stderr, "sweep: bad size at %p + %d > %p", p, size, r);
       // END DEBUG
-#endif
+//#endif
 
       if (mark(p) == gc_color_clear) {
 #if GC_DEBUG_PRINTFS
diff --git a/runtime.c b/runtime.c
index ef0d3bdd..5ec6623f 100644
--- a/runtime.c
+++ b/runtime.c
@@ -2784,7 +2784,7 @@ void GC(void *data, closure cont, object *args, int num_args)
     scani++;
   }
 
-//fprintf(stdout, "DEBUG done minor GC, alloci = %d\n", alloci);
+fprintf(stdout, "DEBUG done minor GC, alloci = %d\n", alloci);
 
 //  // Check if we need to do a major GC
 //  if (heap_grown) {