diff --git a/algo/core/filter.cpp b/algo/core/filter.cpp
index 41227348fc0d31133de528bce6991bbf08485531..3ecf76ff46fde07f6c5a0743ce91a8f1d56a8d9d 100644
--- a/algo/core/filter.cpp
+++ b/algo/core/filter.cpp
@@ -90,19 +90,15 @@ BioReader filterBioReaderWithACAutomaton(
     set<pair<KmerAffect, int>, Comparator> setOfWords(mapAho.begin(), mapAho.end(), compFunctor);
     set<pair<KmerAffect, int>, Comparator>::iterator setIt = setOfWords.begin();
     // Iterate over the pair and not the map
-    int nbKmers = 0;
+    int nbKmers = 0, previousOccurences = 0;
     for(pair<KmerAffect, int> element : setOfWords){
       // Add corresponding sequences to the BioReader
-      if(nbKmers < kmer_threshold){
-        nbKmers++;
-        /* Check if next K-mer has same occurence */
-        if(nbKmers == kmer_threshold){
-          std::advance(setIt, nbKmers);
-          pair<KmerAffect, int> pNext = *setIt;
-          int nextKmerOccurs = pNext.second;
-          if(nextKmerOccurs == element.second){
-            nbKmers--;
-          }
+        if(nbKmers == kmer_threshold && previousOccurences == element.second){
+          //Keep the same amount of genes
+        }else if(nbKmers < kmer_threshold){
+          nbKmers++;
+        }else{
+          break;
         }
         tmpKmer = element.first;
         asciiChar = tmpKmer.getLabel().at(0);
@@ -113,11 +109,7 @@ BioReader filterBioReaderWithACAutomaton(
         for(int i = indexes->at(asciiNum - 1); i < indexes->at(asciiNum); ++i){
           result.add(origin.read(i));
         }
-      }
-      else{
-        /* Enough K-mers used for filtering, no need to go further */
-        break;
-      }
+        previousOccurences = element.second;
     }
   }
   return (result.size() == 0) ? origin : result;
diff --git a/algo/tests/unit-tests/testFilter.cpp b/algo/tests/unit-tests/testFilter.cpp
index 90645ae315339c2d96eef8fec756c3a11aeb0ce4..fc3ba609e1870bbf2bcb2572727bdc6e171e75b0 100644
--- a/algo/tests/unit-tests/testFilter.cpp
+++ b/algo/tests/unit-tests/testFilter.cpp
@@ -385,6 +385,7 @@ void testExAequoKmersWhenSignificantParameter(){
   seqtype seq;
   pair<vector<int>*, AbstractACAutomaton<KmerAffect>*>* p;
   string BIOREADER_EXAEQUO = "BioReader doesn't have ex-aequo";
+  string SIZE_BIOREADER = "BioReader doesn't contain the good amount of sequences";
   Sequence sequences[13];
   sequences[0] = {"seq1-full_name", "seq-01*01", "AGCTAGCTA","", NULL, 0};
   sequences[1] = {"seq1-full_name", "seq-01*02", "AGCTAGCTT", "", NULL, 0};
@@ -418,18 +419,45 @@ void testExAequoKmersWhenSignificantParameter(){
   while(j < filtered.size() && extractGeneName(filtered.label(j)) != extractGeneName(testedBioReader.label(10))){
     ++j;
   }
+  /* Check that filtered BioReader contains sequence n°11 which is the most present in the sequence. */
+  int k = 0;
+  while(k < filtered.size() && extractGeneName(filtered.label(k)) != extractGeneName(testedBioReader.label(11))){
+    ++k;
+  }
+
+  /* Even though the filtered function got 2 as a parameter, since there are two ex-aequo the size is 3 */
+  TAP_TEST(filtered.size() == 3, TEST_FILTER_BIOREADER_WITH_AC_AUTOMATON, SIZE_BIOREADER);
   TAP_TEST(i < filtered.size(), TEST_FILTER_BIOREADER_WITH_AC_AUTOMATON, BIOREADER_EXAEQUO);
   TAP_TEST(j < filtered.size(), TEST_FILTER_BIOREADER_WITH_AC_AUTOMATON, BIOREADER_EXAEQUO);
+  TAP_TEST(k < filtered.size(), TEST_FILTER_BIOREADER_WITH_AC_AUTOMATON, BIOREADER_EXAEQUO);
   /* Add a third ex-aequo: k-mer belonging to sequence n°12 appearing 29 times */
   seq += "CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC";
   delete p->first; delete p->second; delete p;
   p = buildACAutomatonToFilterBioReader(testedBioReader, "####");
   filtered = filterBioReaderWithACAutomaton(p, testedBioReader, seq, 2);
-  int k = 0;
-  while(k < filtered.size() && extractGeneName(filtered.label(k)) != extractGeneName(testedBioReader.label(12))){
+  /* Check that filtered BioReader contains previous sequences and n°12 */
+  i = 0;
+  while(i < filtered.size() && extractGeneName(filtered.label(i)) != extractGeneName(testedBioReader.label(5))){
+    ++i;
+  }
+  j = 0;
+  while(j < filtered.size() && extractGeneName(filtered.label(j)) != extractGeneName(testedBioReader.label(10))){
+    ++j;
+  }
+  k = 0;
+  while(k < filtered.size() && extractGeneName(filtered.label(k)) != extractGeneName(testedBioReader.label(11))){
     ++k;
   }
+  int l = 0;
+  while(l < filtered.size() && extractGeneName(filtered.label(l)) != extractGeneName(testedBioReader.label(12))){
+    ++l;
+  }
+  /* Even though the filtered function got 2 as a parameter, since there are three ex-aequo the size is 4 */
+  TAP_TEST(filtered.size() == 4, TEST_FILTER_BIOREADER_WITH_AC_AUTOMATON, SIZE_BIOREADER);
+  TAP_TEST(i < filtered.size(), TEST_FILTER_BIOREADER_WITH_AC_AUTOMATON, BIOREADER_EXAEQUO);
+  TAP_TEST(j < filtered.size(), TEST_FILTER_BIOREADER_WITH_AC_AUTOMATON, BIOREADER_EXAEQUO);
   TAP_TEST(k < filtered.size(), TEST_FILTER_BIOREADER_WITH_AC_AUTOMATON, BIOREADER_EXAEQUO);
+  TAP_TEST(l < filtered.size(), TEST_FILTER_BIOREADER_WITH_AC_AUTOMATON, BIOREADER_EXAEQUO);
   delete p->first; delete p->second; delete p;
 }