diff --git a/src/core/src/signature.rs b/src/core/src/signature.rs
index f223b32bc..8aa568b05 100644
--- a/src/core/src/signature.rs
+++ b/src/core/src/signature.rs
@@ -229,7 +229,7 @@ impl SigsTrait for Sketch {
         match *self {
             Sketch::MinHash(ref mut mh) => mh.add_sequence(seq, force),
             Sketch::LargeMinHash(ref mut mh) => mh.add_sequence(seq, force),
-            Sketch::HyperLogLog(_) => unimplemented!(),
+            Sketch::HyperLogLog(ref mut hll) => hll.add_sequence(seq, force),
         }
     }
 
@@ -237,7 +237,7 @@ impl SigsTrait for Sketch {
         match *self {
             Sketch::MinHash(ref mut mh) => mh.add_protein(seq),
             Sketch::LargeMinHash(ref mut mh) => mh.add_protein(seq),
-            Sketch::HyperLogLog(_) => unimplemented!(),
+            Sketch::HyperLogLog(ref mut hll) => hll.add_protein(seq),
         }
     }
 }