1 files changed, 14 insertions, 1 deletions
diff --git a/repo.go b/repo.go
index 8df6fdf..457dadd 100644
--- a/repo.go
+++ b/repo.go
@@ -223,12 +223,25 @@ func hashChunks(chunks <-chan StoredChunk) (FingerprintMap, SketchMap) {
 		fingerprints[h] = c.Id()
 		sketch, _ := SketchChunk(c, 32, 3, 4)
 		for _, s := range sketch {
-			sketches[s] = append(sketches[s], c.Id())
+			prev := sketches[s]
+			if contains(prev, c.Id()) {
+				continue
+			}
+			sketches[s] = append(prev, c.Id())
 		}
 	}
 	return fingerprints, sketches
 }
 
+func contains(s []*ChunkId, id *ChunkId) bool {
+	for _, v := range s {
+		if v == id {
+			return true
+		}
+	}
+	return false
+}
+
 func findSimilarChunk(chunk Chunk, sketches SketchMap) (*ChunkId, bool) {
 	var similarChunks = make(map[ChunkId]int)
 	var max int