diff --git a/eo/tutorial/ParadisEO/Lesson3/CellularBitEA.cpp b/eo/tutorial/ParadisEO/Lesson3/CellularBitEA.cpp
index 41640b355..42cb4a958 100644
--- a/eo/tutorial/ParadisEO/Lesson3/CellularBitEA.cpp
+++ b/eo/tutorial/ParadisEO/Lesson3/CellularBitEA.cpp
@@ -9,6 +9,8 @@ typedef eoBit<double> Indi;
 
 #include "binary_value.h"
 
+using namespace std;
+
 void main_function(int argc, char **argv)
 {
 
diff --git a/eo/tutorial/ParadisEO/Lesson3/Makefile b/eo/tutorial/ParadisEO/Lesson3/Makefile
index 2e5c0fdfc..3b255b387 100644
--- a/eo/tutorial/ParadisEO/Lesson3/Makefile
+++ b/eo/tutorial/ParadisEO/Lesson3/Makefile
@@ -1,3 +1,4 @@
+.SUFFIXES: .cpp
 .cpp: ; c++  -DPACKAGE=\"eo\" -DVERSION=\"0.9.1\" -I. -I../../../src -Wall -g  -o $@  $*.cpp ../../../src/utils/libeoutils.a ../../../src/libeo.a
 
 .cpp.o: ; c++ -DPACKAGE=\"eo\" -DVERSION=\"0.9.1\" -I. -I../../../src -Wall -g -c $*.cpp
diff --git a/eo/tutorial/ParadisEO/Lesson3/binary_value.h b/eo/tutorial/ParadisEO/Lesson3/binary_value.h
index a31c08644..f2f5d6ca1 100644
--- a/eo/tutorial/ParadisEO/Lesson3/binary_value.h
+++ b/eo/tutorial/ParadisEO/Lesson3/binary_value.h
@@ -7,7 +7,7 @@
     @param _chrom A binary chromosome 
 */
 // INIT
-double binary_value(const vector<bool>& _chrom)
+double binary_value(const std::vector<bool>& _chrom)
 {
   double sum = 0;
   for (unsigned i = 0; i < _chrom.size(); i++)