diff --git a/common/coords.go b/common/coords.go
index 8b33b33..dce9b46 100644
--- a/common/coords.go
+++ b/common/coords.go
@@ -4,9 +4,17 @@
 
 package common
 
-import "strconv"
+import (
+	"fmt"
+	"strconv"
+)
 
 // Constructs a database key out of byte slice.
 func DecodePosFromBytes(key []byte) (pos int64, err error) {
 	return strconv.ParseInt(string(key), 10, 64)
 }
+
+// Encode a block pos to byte slice.
+func EncodePosToBytes(key int64) []byte {
+	return []byte(fmt.Sprintf("%d", key))
+}
diff --git a/sqlite.go b/sqlite.go
index 2984eb0..4f4cc6d 100644
--- a/sqlite.go
+++ b/sqlite.go
@@ -242,12 +242,12 @@ func (ss *SqliteSession) AllKeys(hash []byte) (keys chan []byte, n int, err erro
 		defer rows.Close()
 		defer close(keys)
 		for rows.Next() {
-			var key []byte
+			var key int64
 			if err := rows.Scan(&key); err != nil {
 				log.Printf("WARN: %s", err)
 				break
 			}
-			keys <- key
+			keys <- common.EncodePosToBytes(key)
 		}
 	}()