diff --git a/Cargo.toml b/Cargo.toml
index f5edbac90..fb3e708ae 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -65,7 +65,7 @@ tantivy-bitpacker = { version = "0.10", path = "./bitpacker" }
 common = { version = "0.11", path = "./common/", package = "tantivy-common" }
 tokenizer-api = { version = "0.7", path = "./tokenizer-api", package = "tantivy-tokenizer-api" }
 sketches-ddsketch = { version = "0.4", features = ["use_serde"] }
-datasketches = { git = "https://github.com/fulmicoton-dd/datasketches-rust", rev = "7635fb8" }
+datasketches = { version = "0.3.0", features = ["hll"] }
 futures-util = { version = "0.3.28", optional = true }
 futures-channel = { version = "0.3.28", optional = true }
 fnv = "1.0.7"
diff --git a/src/aggregation/metric/cardinality.rs b/src/aggregation/metric/cardinality.rs
index 7378d2490..c60ee5f48 100644
--- a/src/aggregation/metric/cardinality.rs
+++ b/src/aggregation/metric/cardinality.rs
@@ -166,7 +166,11 @@ impl CouponCache {
         let should_use_dense =
             highest_term_ord < 1_000_000u64 || highest_term_ord < num_terms as u64 * 3u64;
         if should_use_dense {
-            let mut coupon_map: Vec<Coupon> = vec![Coupon::EMPTY; highest_term_ord as usize + 1];
+            // We don't really care about the value here. We will populate all the values we will
+            // read anyway.
+            let uninitialized_coupon = Coupon::from_hash(0);
+            let mut coupon_map: Vec<Coupon> =
+                vec![uninitialized_coupon; highest_term_ord as usize + 1];
             for (term_ord, coupon) in term_ords.into_iter().zip(coupons.into_iter()) {
                 coupon_map[term_ord as usize] = coupon;
             }