diff --git a/eo/src/eoInit.h b/eo/src/eoInit.h
index a73310778..58eef63e0 100644
--- a/eo/src/eoInit.h
+++ b/eo/src/eoInit.h
@@ -193,17 +193,19 @@ class eoInitPermutation: public eoInit<EOT> // FIXME inherit from eoInitWithDim
         virtual void operator()(EOT& chrom)
         {
             chrom.resize(chromSize);
-            for(unsigned idx=0;idx <chrom.size();idx++)
-                        chrom[idx]=idx+startFrom;
+            for(unsigned idx=0; idx < chrom.size(); idx++) {
+                chrom[idx] = idx+startFrom;
+            }
 
-            std::shuffle(chrom.begin(), chrom.end(),gen);
+            UF_random_generator<unsigned int> gen(chrom.size());
+            std::shuffle(chrom.begin(), chrom.end(), gen);
             chrom.invalidate();
         }
 
     private :
         unsigned chromSize;
         unsigned startFrom;
-        UF_random_generator<unsigned int> gen;
+        // UF_random_generator<unsigned int> gen;
 };
 /** @example t-eoInitPermutation.cpp
  */
diff --git a/eo/src/utils/rnd_generators.h b/eo/src/utils/rnd_generators.h
index 60ff04b3f..01b682b67 100644
--- a/eo/src/utils/rnd_generators.h
+++ b/eo/src/utils/rnd_generators.h
@@ -89,7 +89,8 @@ class boolean_generator
    either between [0, _max) if only one value (_max) is given to the ctor
    or in [_min,_max) if 2 values are given (_min, _max)
 */
-template <class T = uint32_t> class random_generator
+template <class T = uint32_t>
+class random_generator
 {
   public :
   // added new ctor with 2 params, and modified the data to minim and range
@@ -123,16 +124,25 @@ inline bool random_generator<bool>::operator()(void)
    function (see eoPop::shuffle): its operator() takes an unsigned argument m
    and  must return an unsigned uniformly distributed in [0,m}
 */
-template <class T = uint32_t> class UF_random_generator
+template <class T = uint32_t>
+class UF_random_generator
 {
-  public :
-    UF_random_generator(eoRng& _rng = rng) :
-      random(_rng) {}
+    public :
+        using result_type = T;
 
-  T operator()(T _t) { return (T) (random.random(_t)); }
+        UF_random_generator(T max, eoRng& _rng = rng)
+            : _max(max), _random(_rng)
+        {}
 
-private :
-  eoRng& random;
+        T operator()() { return _random.random(_max); }
+        T operator()(T m) { return _random.random(m); }
+
+        T min() { return 0; }
+        T max() { return _max; }
+
+    private :
+        T _max;
+        eoRng& _random;
 };
 
 
diff --git a/eo/test/t-eoInitPermutation.cpp b/eo/test/t-eoInitPermutation.cpp
index 4b64f3576..44af6f6b0 100644
--- a/eo/test/t-eoInitPermutation.cpp
+++ b/eo/test/t-eoInitPermutation.cpp
@@ -43,7 +43,7 @@ int main()
   unsigned i;
 
    // a chromosome randomizer
-  eoInitPermutation <Chrom> random(CHROM_SIZE);
+  eoInitPermutation <Chrom> randomize(CHROM_SIZE);
 
    // the population:
   eoPop<Chrom> pop;
@@ -55,7 +55,7 @@ int main()
     {
       Chrom chrom(CHROM_SIZE);
       std::cout << " Initial chromosome n°" << i << " : " << chrom << "..." <<  std::endl;
-      random(chrom);
+      randomize(chrom);
       eval(chrom);
       std::cout << " ... becomes : " << chrom << " after initialization" << std::endl;
       check_permutation(chrom);
diff --git a/eo/test/t-eobin.cpp b/eo/test/t-eobin.cpp
index 2a36d0ee1..4d3445faa 100644
--- a/eo/test/t-eobin.cpp
+++ b/eo/test/t-eobin.cpp
@@ -123,17 +123,17 @@ void main_function()
 	   << chrom << " " << chrom2 << std::endl;
     }
 
-  for (i = 1; i < SIZE / 2; i++)
-    for (j = 1; j < SIZE / 2; j++)
-      {
-	eoBitGxOver<Chrom> gxover(i, j);
-	std::fill(chrom.begin(), chrom.end(), false);
-	std::fill(chrom2.begin(), chrom2.end(), true);
-	gxover(chrom, chrom2);
-	chrom.fitness(binary_value(chrom)); chrom2.fitness(binary_value(chrom2));
-	std::cout  << "eoBinGxOver(" << i << ", " << j << ") ..... "
-	      << chrom << " " << chrom2 << std::endl;
+  for (i = 1; i < SIZE / 2; i++) {
+    for (j = 1; j < SIZE / 2; j++) {
+        eoBitGxOver<Chrom> gxover(i, j);
+        std::fill(chrom.begin(), chrom.end(), false);
+        std::fill(chrom2.begin(), chrom2.end(), true);
+        gxover(chrom, chrom2);
+        chrom.fitness(binary_value(chrom)); chrom2.fitness(binary_value(chrom2));
+        std::cout  << "eoBinGxOver(" << i << ", " << j << ") ..... "
+              << chrom << " " << chrom2 << std::endl;
       }
+  }
 
     // test SGA algorithm
     eoGenContinue<Chrom> continuator1(50);
diff --git a/mo/src/neighborhood/moRndVectorVNSelection.h b/mo/src/neighborhood/moRndVectorVNSelection.h
index 3debb85d4..a460f2d45 100644
--- a/mo/src/neighborhood/moRndVectorVNSelection.h
+++ b/mo/src/neighborhood/moRndVectorVNSelection.h
@@ -86,6 +86,7 @@ public:
       for(unsigned int i = 0; i < LSvector.size(); i++)
 	order.push_back(i);
     
+    UF_random_generator<unsigned int> gen(order.size());
     std::random_shuffle(order.begin(), order.end(), gen);
 
     currentOrder = 0;
@@ -110,9 +111,6 @@ private:
   unsigned int currentOrder;
   // the index of heuristics in random order
   std::vector<unsigned int> order;
-  // random generator
-  UF_random_generator<unsigned int> gen;
-
 };
 
 #endif
diff --git a/moeo/src/selection/moeoDetArchiveSelect.h b/moeo/src/selection/moeoDetArchiveSelect.h
index 81e09e36c..78b69a06e 100644
--- a/moeo/src/selection/moeoDetArchiveSelect.h
+++ b/moeo/src/selection/moeoDetArchiveSelect.h
@@ -71,10 +71,10 @@ class moeoDetArchiveSelect : public eoSelect<MOEOT>
 						_dest.push_back(archive[i]);
 				}
 				else if (archive_size > max){
-					UF_random_generator<unsigned int> rndGen;
 					std::vector <int> permutation;
 					for(unsigned int i=0; i < archive_size; i++)
 						permutation.push_back(i);
+					UF_random_generator<unsigned int> rndGen(permutation.size());
 					random_shuffle(permutation.begin(), permutation.end(), rndGen);
 					for (unsigned int i=0; i<max; i++)
 						_dest.push_back(archive[permutation[i]]);
diff --git a/moeo/src/selection/moeoNumberUnvisitedSelect.h b/moeo/src/selection/moeoNumberUnvisitedSelect.h
index afe0d5d4d..d31fb2ef2 100644
--- a/moeo/src/selection/moeoNumberUnvisitedSelect.h
+++ b/moeo/src/selection/moeoNumberUnvisitedSelect.h
@@ -72,7 +72,7 @@ public:
             	res.push_back(i);
         }
         if(number < res.size()){
-        	UF_random_generator<unsigned int> rndGen;
+        	UF_random_generator<unsigned int> rndGen(res.size());
         	std::random_shuffle(res.begin(), res.end(), rndGen);
         	res.resize(number);
         }