diff --git a/core/src/db/Utils.cpp b/core/src/db/Utils.cpp
index b79305220bed4f23a8862a7c081082dc0624642f..a862c03ef441b1561ddb950f5ee8058ea447b603 100644
--- a/core/src/db/Utils.cpp
+++ b/core/src/db/Utils.cpp
@@ -221,12 +221,6 @@ IsRawIndexType(int32_t type) {
     return (type == (int32_t)EngineType::FAISS_IDMAP) || (type == (int32_t)EngineType::FAISS_BIN_IDMAP);
 }
 
-bool
-IsBinaryIndexType(int32_t index_type) {
-    return (index_type == (int32_t)engine::EngineType::FAISS_BIN_IDMAP) ||
-           (index_type == (int32_t)engine::EngineType::FAISS_BIN_IVFFLAT);
-}
-
 bool
 IsBinaryMetricType(int32_t metric_type) {
     return (metric_type == (int32_t)engine::MetricType::HAMMING) ||
diff --git a/core/src/db/Utils.h b/core/src/db/Utils.h
index b57167295e4f796064a2ae0fa8bb1644cffb868d..589ef060c7a69d569736b19d3663541301c5f574 100644
--- a/core/src/db/Utils.h
+++ b/core/src/db/Utils.h
@@ -48,9 +48,6 @@ IsSameIndex(const CollectionIndex& index1, const CollectionIndex& index2);
 bool
 IsRawIndexType(int32_t type);
 
-static bool
-IsBinaryIndexType(int32_t index_type);
-
 bool
 IsBinaryMetricType(int32_t metric_type);