diff --git a/tsdb/head.go b/tsdb/head.go
index 4352d86d9e..db40eb89e8 100644
--- a/tsdb/head.go
+++ b/tsdb/head.go
@@ -752,6 +752,11 @@ func (h *Head) Init(minValidTime int64) error {
 	return nil
 }
 
+// SetMinValidTime sets the minimum timestamp the head can ingest.
+func (h *Head) SetMinValidTime(minValidTime int64) {
+	h.minValidTime.Store(minValidTime)
+}
+
 func (h *Head) loadMmappedChunks() (map[uint64][]*mmappedChunk, error) {
 	mmappedChunks := map[uint64][]*mmappedChunk{}
 	if err := h.chunkDiskMapper.IterateAllChunks(func(seriesRef, chunkRef uint64, mint, maxt int64, numSamples uint16) error {