diff --git a/src/share/io/io_schedule/ob_io_mclock.cpp b/src/share/io/io_schedule/ob_io_mclock.cpp
index ff2b2c8e6..2640c6411 100644
--- a/src/share/io/io_schedule/ob_io_mclock.cpp
+++ b/src/share/io/io_schedule/ob_io_mclock.cpp
@@ -532,7 +532,7 @@ int64_t ObTenantIOClock::get_max_proportion_ts()
   return max_proportion_ts;
 }
 
-int ObTenantIOClock::get_mclock(const int64_t queue_index, ObMClock *mclock)
+int ObTenantIOClock::get_mclock(const int64_t queue_index, ObMClock *&mclock)
 {
   int ret = OB_SUCCESS;
   if (queue_index >= group_clocks_.count()) {
diff --git a/src/share/io/io_schedule/ob_io_mclock.h b/src/share/io/io_schedule/ob_io_mclock.h
index f0ab0569b..4ffcf9cdf 100644
--- a/src/share/io/io_schedule/ob_io_mclock.h
+++ b/src/share/io/io_schedule/ob_io_mclock.h
@@ -86,7 +86,7 @@ public:
   int64_t get_unit_limit(const ObIOMode mode) const { return unit_clocks_[static_cast<int>(mode)].iops_; }
   TO_STRING_KV(K(is_inited_), K(io_config_), K(io_usage_), K(group_clocks_));
 private:
-  int get_mclock(const int64_t queue_index, ObMClock *mclock);
+  int get_mclock(const int64_t queue_index, ObMClock *&mclock);
   int64_t calc_iops(const int64_t iops, const int64_t percentage);
   int64_t calc_weight(const int64_t weight, const int64_t percentage);
 private: