diff --git a/storage/local/storage.go b/storage/local/storage.go
index 81e1fd730..3945509ec 100644
--- a/storage/local/storage.go
+++ b/storage/local/storage.go
@@ -383,7 +383,7 @@ func (s *MemorySeriesStorage) Start() (err error) {
 	for fp := range s.fpToSeries.fpIter() {
 		if series, ok := s.fpToSeries.get(fp); ok {
 			if !series.headChunkClosed {
-				openHeadCount += 1
+				openHeadCount++
 			}
 		}
 	}