diff --git a/circuit.h b/circuit.h
index 72f505d..1239b43 100644
--- a/circuit.h
+++ b/circuit.h
@@ -86,7 +86,7 @@ int* flip_need_update;
 std::vector<Gate*> flip_update_queue;
 
 // incremental stem struct
-const int STEM_INC = 2;
+int STEM_INC = 0;
 const int STEM_WEIGHT_MAX = 1e9;
 ll stem_total_weight;
 int stem_total_cnt;
diff --git a/ls.cpp b/ls.cpp
index 00f5f08..21e164a 100644
--- a/ls.cpp
+++ b/ls.cpp
@@ -138,7 +138,7 @@ bool Circuit::local_search(std::unordered_set<Fault*> &faults) {
 
 void Circuit::ls_update_weight() {
 
-    //STEM_INC += 5;
+    STEM_INC += 1;
 
     if(rand() % 10000 <= SP * 10000) {
         for(Gate* g : gates) {
@@ -280,6 +280,8 @@ void Circuit::ls_init_data_structs() {
         }
     }
 
+    STEM_INC = 0;
+
     fault_propagate_score = 0;
 
     fault_propagate_tatal_len = 0;