diff --git a/src/iocore/cache/CacheWrite.cc b/src/iocore/cache/CacheWrite.cc
index e1db30375b5..fd4f87efab7 100644
--- a/src/iocore/cache/CacheWrite.cc
+++ b/src/iocore/cache/CacheWrite.cc
@@ -731,10 +731,9 @@ agg_copy(char *p, CacheVC *vc)
         ProxyMutex *mutex ATS_UNUSED = vc->stripe->mutex.get();
         ink_assert(mutex->thread_holding == this_ethread());
 
-// ToDo: Why are these for debug only ?
 #ifdef DEBUG
-        Metrics::Counter::increment(cache_rsb.write_backlog_failure);
-        Metrics::Counter::increment(stripe->cache_vol->vol_rsb.write_backlog_failure);
+        Metrics::Counter::increment(cache_rsb.write_bytes, vc->write_len);
+        Metrics::Counter::increment(stripe->cache_vol->vol_rsb.write_bytes, vc->write_len);
 #endif
       }
       if (vc->f.rewrite_resident_alt) {