diff --git a/compactor/compactor.go b/compactor/compactor.go
index 270287072d8..5cf7b65094a 100644
--- a/compactor/compactor.go
+++ b/compactor/compactor.go
@@ -105,7 +105,7 @@ func (t *Periodic) Run() {
 				last = clock.Now()
 				plog.Noticef("Finished auto-compaction at revision %d", rev)
 			} else {
-				plog.Noticef("Failed auto-compaction at revision %d (%v)", err, rev)
+				plog.Noticef("Failed auto-compaction at revision %d (%v)", rev, err)
 				plog.Noticef("Retry after %v", checkCompactionInterval)
 			}
 		}