diff --git a/src/server/hotkey_collector.cpp b/src/server/hotkey_collector.cpp
index fda14b9646..b06e2345be 100644
--- a/src/server/hotkey_collector.cpp
+++ b/src/server/hotkey_collector.cpp
@@ -35,7 +35,7 @@ DSN_DEFINE_uint32(
     "the variance threshold to detect hot bucket during coarse analysis of hotkey detection");
 DSN_TAG_VARIABLE(hot_bucket_variance_threshold, FT_MUTABLE);
 DSN_DEFINE_validator(hot_bucket_variance_threshold,
-                     [](int32_t threshold) -> bool { return threshold >= 0 });
+                     [](int32_t threshold) -> bool { return threshold >= 0; });
 
 DSN_DEFINE_uint32(
     "pegasus.server",
@@ -44,7 +44,7 @@ DSN_DEFINE_uint32(
     "the variance threshold to detect hot key during fine analysis of hotkey detection");
 DSN_TAG_VARIABLE(hot_key_variance_threshold, FT_MUTABLE);
 DSN_DEFINE_validator(hot_key_variance_threshold,
-                     [](int32_t threshold) -> bool { return threshold >= 0 });
+                     [](int32_t threshold) -> bool { return threshold >= 0; });
 
 DSN_DEFINE_uint32("pegasus.server",
                   hotkey_buckets_num,
@@ -71,7 +71,7 @@ DSN_DEFINE_uint32(
     "the max time (in seconds) allowed to capture hotkey, will stop if hotkey's not found");
 DSN_TAG_VARIABLE(max_seconds_to_detect_hotkey, FT_MUTABLE);
 DSN_DEFINE_validator(max_seconds_to_detect_hotkey,
-                     [](int32_t seconds) -> bool { return seconds >= 0 });
+                     [](int32_t seconds) -> bool { return seconds >= 0; });
 
 // 68–95–99.7 rule, same algorithm as hotspot_partition_calculator::stat_histories_analyse
 /*extern*/ bool
diff --git a/src/server/hotspot_partition_calculator.cpp b/src/server/hotspot_partition_calculator.cpp
index f422808e18..0a148f3952 100644
--- a/src/server/hotspot_partition_calculator.cpp
+++ b/src/server/hotspot_partition_calculator.cpp
@@ -50,14 +50,15 @@ DSN_DEFINE_int32("pegasus.collector",
                  "FLAGS_hotpartition_threshold, this partition is a hot partition");
 DSN_TAG_VARIABLE(hot_partition_threshold, FT_MUTABLE);
 DSN_DEFINE_validator(hot_partition_threshold,
-                     [](int32_t threshold) -> bool { return threshold >= 0 });
+                     [](int32_t threshold) -> bool { return threshold >= 0; });
 
 DSN_DEFINE_int32("pegasus.collector",
                  occurrence_threshold,
                  3,
                  "hot paritiotion occurrence times' threshold to send rpc to detect hotkey");
 DSN_TAG_VARIABLE(occurrence_threshold, FT_MUTABLE);
-DSN_DEFINE_validator(occurrence_threshold, [](int32_t threshold) -> bool { return threshold >= 0 });
+DSN_DEFINE_validator(occurrence_threshold,
+                     [](int32_t threshold) -> bool { return threshold >= 0; });
 
 void hotspot_partition_calculator::data_aggregate(const std::vector<row_data> &partition_stats)
 {