diff --git a/src/common/range_util.cc b/src/common/range_util.cc
index 218933dcc..ed2b3847d 100644
--- a/src/common/range_util.cc
+++ b/src/common/range_util.cc
@@ -65,7 +65,6 @@ GetRangeSearchResult(const faiss::RangeSearchResult& res, const bool is_ip, cons
     distances = new float[total_valid];
     labels = new int64_t[total_valid];
 
-#pragma omp parallel for
     for (auto i = 0; i < nq; i++) {
         FilterRangeSearchResultForOneNq(res.lims[i + 1] - res.lims[i], res.distances + res.lims[i],
                                         res.labels + res.lims[i], is_ip, radius, range_filter, lims[i + 1] - lims[i],
diff --git a/src/index/diskann/diskann.cc b/src/index/diskann/diskann.cc
index 3649e01df..94cbde0f6 100644
--- a/src/index/diskann/diskann.cc
+++ b/src/index/diskann/diskann.cc
@@ -9,8 +9,6 @@
 // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 // or implied. See the License for the specific language governing permissions and limitations under the License.
 
-#include <omp.h>
-
 #include <cstdint>
 
 #include "common/range_util.h"
diff --git a/src/index/hnsw/hnsw.cc b/src/index/hnsw/hnsw.cc
index 8d52f6a89..d82dcd581 100644
--- a/src/index/hnsw/hnsw.cc
+++ b/src/index/hnsw/hnsw.cc
@@ -11,9 +11,6 @@
 
 #include "knowhere/feder/HNSW.h"
 
-#include <omp.h>
-
-#include <exception>
 #include <new>
 
 #include "common/range_util.h"