diff --git a/src/index/svs/svs_flat.cc b/src/index/svs/svs_flat.cc
index 0101586a7..a80f3fdac 100644
--- a/src/index/svs/svs_flat.cc
+++ b/src/index/svs/svs_flat.cc
@@ -76,7 +76,7 @@ class SvsFlatIndexNode : public IndexNode {
             return expected<DataSetPtr>::Err(Status::empty_index, "index not loaded");
         }
 
-        if (!bitset.empty()) {
+        if (!bitset.empty() && bitset.count() > 0) {
             return expected<DataSetPtr>::Err(Status::not_implemented, "SVS Flat does not support bitset filtering");
         }
 
diff --git a/src/index/svs/svs_vamana.cc b/src/index/svs/svs_vamana.cc
index 88fd0f60f..e1e93eb72 100644
--- a/src/index/svs/svs_vamana.cc
+++ b/src/index/svs/svs_vamana.cc
@@ -519,6 +519,8 @@ class SvsVamanaLeanVecIndexNode : public SvsVamanaIndexNode<DataType> {
 
 // temporarily removed `MMAP` until it's fully honored by SVS
 
+KNOWHERE_MOCK_REGISTER_DENSE_FLOAT_ALL_GLOBAL(SVS_VAMANA, SvsVamanaIndexNode, knowhere::feature::NONE)
+
 KNOWHERE_MOCK_REGISTER_DENSE_FLOAT_ALL_GLOBAL(SVS_VAMANA_LVQ, SvsVamanaLvqIndexNode, knowhere::feature::NONE)
 
 KNOWHERE_MOCK_REGISTER_DENSE_FLOAT_ALL_GLOBAL(SVS_VAMANA_LEANVEC, SvsVamanaLeanVecIndexNode, knowhere::feature::NONE)