diff --git a/src/internal_modules/roc_core/mov_quantile.h b/src/internal_modules/roc_core/mov_quantile.h
index 58cc0d53d..36b2c1660 100644
--- a/src/internal_modules/roc_core/mov_quantile.h
+++ b/src/internal_modules/roc_core/mov_quantile.h
@@ -22,26 +22,32 @@ namespace core {
 template <typename T> class MovQuantile {
     public:
         const size_t win_len_;
-        const size_t k_;
+        const size_t percentile_;
+        size_t k_;        
+        size_t heap_size_;
         size_t elem_index_;                 
         bool win_filled_;
+        bool valid_;
         Array<T> heap_;
         Array<size_t> elem_index_heap_index_;
         Array<size_t> heap_index_elem_index_;        
 
-        MovQuantile(IArena& arena, const size_t win_len, const size_t k)
+        MovQuantile(IArena& arena, const size_t win_len, const size_t percentile)
             : win_len_(win_len) 
-            , k_(k) 
+            , percentile_(percentile)
+            , k_(0)
+            , heap_size_(0)
             , elem_index_(0)
-            , win_filled_ (false)            
-            , heap_ (arena)
+            , win_filled_(false)            
+            , valid_(false)
+            , heap_(arena)
             , elem_index_heap_index_(arena)
             , heap_index_elem_index_(arena) {
             if (win_len == 0) {
                 roc_panic("mov quantile: window length must be greater than 0");
             }
-            if (k_ > win_len_){
-                roc_panic("smallest element index should be less than window size");
+            if (percentile > 100){
+                roc_panic("mov quantile: percentile should be between 0 and 100");
             }            
             if (!heap_.resize(win_len)) {
                 return;
@@ -55,22 +61,26 @@ template <typename T> class MovQuantile {
             for(size_t i = 0 ; i < win_len; i++){
                 elem_index_heap_index_[i] = i; 
                 heap_index_elem_index_[i] = i;     
-            }
+            }            
+            valid_ = true;
         }
         bool is_valid(){
-            return (win_len_ == 5);
+            return valid_;
         }
 
         void swap(size_t index_1, size_t index_2){
-            T temp = heap_[index_1];
-            size_t temp_index = heap_index_elem_index_[index_1];
-            heap_[index_1] = heap_[index_2];
-            heap_index_elem_index_[index_1] = heap_index_elem_index_[index_2];
-            heap_[index_2] = temp;
-            heap_index_elem_index_[index_2] = temp_index;
+            size_t elem_index_1 = heap_index_elem_index_[index_1];
+            size_t elem_index_2 = heap_index_elem_index_[index_2];
 
-            elem_index_heap_index_[heap_index_elem_index_[index_1]] = index_2;
-            elem_index_heap_index_[heap_index_elem_index_[index_2]] = index_1;             
+            T temp = heap_[index_1];          
+            heap_[index_1] = heap_[index_2];           
+            heap_[index_2] = temp;
+            
+            heap_index_elem_index_[index_1] = elem_index_2;
+            heap_index_elem_index_[index_2] = elem_index_1;
+            
+            elem_index_heap_index_[elem_index_1] = index_2;
+            elem_index_heap_index_[elem_index_2] = index_1;             
         }
 
         void heapify_up(size_t heap_index){
@@ -85,30 +95,30 @@ template <typename T> class MovQuantile {
             }
         }
 
-        void heapify_down(size_t heap_index, size_t heap_size){
+        void heapify_down(size_t heap_index){
             size_t largest = heap_index;
             
             size_t left = 2*heap_index + 1;
-            if(left < heap_size && heap_[left] < heap_[largest])
+            if(left < heap_size_ && heap_[left] < heap_[largest])
                 largest = left;
             size_t right = 2*heap_index + 2;
-            if(right < heap_size && heap_[right] < heap_[largest])
+            if(right < heap_size_ && heap_[right] < heap_[largest])
                 largest = right;
             
             if(largest != heap_index){
                 swap(heap_index,largest);
-                heapify_down(largest,heap_size);
+                heapify_down(largest);
             }
         }
 
-        void heapify(size_t heap_index, size_t heap_size){
+        void heapify(size_t heap_index){
             size_t parent = (heap_index-1)/2;
             if(heap_index!=0 && heap_[parent] > heap_[heap_index]){
                 heapify_up(heap_index);
                 return;
             }
             else{
-                heapify_down(heap_index,heap_size);
+                heapify_down(heap_index);
                 return;
             }
         }
@@ -116,20 +126,27 @@ template <typename T> class MovQuantile {
         void add(const T& x){
             if ((elem_index_ + 1) == win_len_)
                 win_filled_ = true;
-            size_t heap_size = elem_index_ + 1;
+            heap_size_ = elem_index_ + 1;           
+            
             if(win_filled_){
-               heap_size = win_len_; 
+               heap_size_ = win_len_; 
             } 
+            elem_index_ = (elem_index_) % win_len_;
+            k_ = (percentile_ * heap_size_)/100;
             size_t heap_index = elem_index_heap_index_[elem_index_];
             heap_[heap_index] = x;
-            heapify(heap_index,heap_size);
-            elem_index_ = (elem_index_ + 1) % win_len_;                      
+            heapify(heap_index);
+            elem_index_ = elem_index_ + 1;                      
             
         }
-
+        
         T sliding_minimum(){
             return heap_[0];
         }
+
+        size_t k_value(){
+            return k_;
+        }
 };
 
 
diff --git a/src/tests/roc_core/test_mov_quantile.cpp b/src/tests/roc_core/test_mov_quantile.cpp
index c9471ebf6..bd151c8c3 100644
--- a/src/tests/roc_core/test_mov_quantile.cpp
+++ b/src/tests/roc_core/test_mov_quantile.cpp
@@ -20,21 +20,28 @@ TEST_GROUP(movquantile){
 
 TEST(movquantile, testing_code){
     const size_t n = 7;
-    MovQuantile<int64_t> quant(arena,n,2);
-    quant.add(5);
-    quant.add(4);
-    quant.add(2);
+    MovQuantile<int64_t> quant(arena,n,62);
     quant.add(5);
+    quant.add(4);    
+    quant.add(2);    
+    quant.add(6);
     quant.add(6);
 
     int64_t x = quant.sliding_minimum();
+    size_t k1 = quant.k_value();
     LONGS_EQUAL((int64_t)2,x);
-    
+    CHECK_EQUAL((size_t)3,k1);
     quant.add(10);
     quant.add(12);
+    LONGS_EQUAL((int64_t)2,quant.sliding_minimum());
     quant.add(4);
+    LONGS_EQUAL((int64_t)2,quant.sliding_minimum());
+    quant.add(1);
+    quant.add(8);
     int64_t x1 = quant.sliding_minimum();
-    LONGS_EQUAL((int64_t)4,x1);
+    size_t k2 = quant.k_value();
+    CHECK_EQUAL((size_t)4,k2);
+    LONGS_EQUAL((int64_t)1,x1);
 }
 }
 }