diff --git a/eo/contrib/MGE/eoInitVirus.h b/eo/contrib/MGE/eoInitVirus.h
index f114f1a3b..f4cb53072 100644
--- a/eo/contrib/MGE/eoInitVirus.h
+++ b/eo/contrib/MGE/eoInitVirus.h
@@ -41,7 +41,7 @@ template <class FitT>
 class eoInitVirus: public eoInit< eoVirus<FitT> > {
 public:
 
-  eoInitVirus(unsigned _combien, eoRndGenerator<char>& _generator )
+  eoInitVirus(unsigned _combien, eoRndGenerator<bool>& _generator )
 	: combien(_combien), generator(_generator) {}
 
   virtual void operator()( eoVirus<FitT>& chrom)
@@ -58,7 +58,7 @@ public:
 private :
   unsigned combien;
   /// generic wrapper for eoFunctor (s), to make them have the function-pointer style copy semantics
-  eoSTLF<char> generator;
+  eoSTLF<bool> generator;
 };
 
 /// Inits the virus with one bit to the left set to one
@@ -66,7 +66,7 @@ template <class FitT>
 class eoInitVirus1bit: public eoInit< eoVirus<FitT> > {
 public:
 
-  eoInitVirus1bit(unsigned _combien, eoRndGenerator<char>& _generator )
+  eoInitVirus1bit(unsigned _combien, eoRndGenerator<bool>& _generator )
 	: combien(_combien), generator(_generator) {}
 
   virtual void operator()( eoVirus<FitT>& chrom)
@@ -81,6 +81,6 @@ public:
 private :
   unsigned combien;
   /// generic wrapper for eoFunctor (s), to make them have the function-pointer style copy semantics
-  eoSTLF<char> generator;
+  eoSTLF<bool> generator;
 };
 #endif
diff --git a/eo/src/ga/eoBit.h b/eo/src/ga/eoBit.h
index 3333099b4..320a5b7d1 100644
--- a/eo/src/ga/eoBit.h
+++ b/eo/src/ga/eoBit.h
@@ -60,12 +60,12 @@ Example of a complete test program that use various bitstrings operators:
 Based on STL's std::vector<bool> specialization.
 */
 
-template <class FitT, class ScalarT = char>
+template <class FitT, class ScalarT = bool> 
 
 class eoBit: public eoVector<FitT, ScalarT>
 {
 public:
-    using ScalarType = ScalarT;
+    using ScalarType = ScalarT; 
 
     using eoVector< FitT, ScalarType >::begin;
     using eoVector< FitT, ScalarType >::end;
diff --git a/eo/src/ga/make_genotype_ga.h b/eo/src/ga/make_genotype_ga.h
index fd877f02d..3a1afaa84 100644
--- a/eo/src/ga/make_genotype_ga.h
+++ b/eo/src/ga/make_genotype_ga.h
@@ -68,7 +68,7 @@ eoInit<EOT> & do_make_genotype(eoParser& _parser, eoState& _state, EOT, float _b
 
   // Then we can built a bitstring random initializer
   // based on boolean_generator class (see utils/rnd_generator.h)
-  eoBooleanGenerator<char> * gen = new eoBooleanGenerator<char>(_bias);
+  eoBooleanGenerator<bool> * gen = new eoBooleanGenerator<bool>(_bias);
   _state.storeFunctor(gen);
   eoInitFixedLength<EOT>* init = new eoInitFixedLength<EOT>(theSize, *gen);
   // store in state
diff --git a/eo/src/utils/eoRndGenerators.h b/eo/src/utils/eoRndGenerators.h
index 48cd82af1..e1168dcd2 100644
--- a/eo/src/utils/eoRndGenerators.h
+++ b/eo/src/utils/eoRndGenerators.h
@@ -115,7 +115,7 @@ inline bool eoUniformGenerator<bool>::operator()(void)
    to easily generate random booleans with a specified bias
    \ingroup bitstring
 */
-template<class T=char>
+template<class T=bool>
 class eoBooleanGenerator : public eoRndGenerator<T>
 {
     public :
diff --git a/mo/test/t-moNKlandscapesIncrEval.cpp b/mo/test/t-moNKlandscapesIncrEval.cpp
index f9a76662b..cf9df9de1 100644
--- a/mo/test/t-moNKlandscapesIncrEval.cpp
+++ b/mo/test/t-moNKlandscapesIncrEval.cpp
@@ -56,7 +56,7 @@ int main() {
   nkLandscapesEval<Solution> eval(N, K);
 
   // init
-  eoUniformGenerator<char> uGen;
+  eoUniformGenerator<bool> uGen;
   eoInitFixedLength<Solution> init(N, uGen);
 
   // verif constructor