diff --git a/internal/core/src/segcore/reduce_c.cpp b/internal/core/src/segcore/reduce_c.cpp
index 459818ca7c..e50abe9c28 100644
--- a/internal/core/src/segcore/reduce_c.cpp
+++ b/internal/core/src/segcore/reduce_c.cpp
@@ -94,7 +94,7 @@ GetResultData(std::vector<std::vector<int64_t>>& search_records,
         // remove duplicates
         if (curr_pk == -1 || std::abs(curr_dis - prev_dis) > 0.00001) {
             result_pair.search_result_->result_offsets_.push_back(loc_offset++);
-            search_records[index].push_back(result_pair.offset_++);
+            search_records[index].push_back(result_pair.offset_);
             prev_dis = curr_dis;
             prev_pk_set.clear();
             prev_pk_set.insert(curr_pk);
@@ -105,15 +105,15 @@ GetResultData(std::vector<std::vector<int64_t>>& search_records,
             //    e3: [100, 0.99]   ==> duplicated, should remove
             if (prev_pk_set.count(curr_pk) == 0) {
                 result_pair.search_result_->result_offsets_.push_back(loc_offset++);
-                search_records[index].push_back(result_pair.offset_++);
+                search_records[index].push_back(result_pair.offset_);
                 // prev_pk_set keeps all primary keys with same distance
                 prev_pk_set.insert(curr_pk);
             } else {
                 // the entity with same distance and same primary key must be duplicated
-                result_pair.offset_++;
                 LOG_SEGCORE_DEBUG_ << "skip duplicated search result, primary key " << curr_pk;
             }
         }
+        result_pair.offset_++;
     }
 #endif
 }