diff --git a/eo/tutorial/Lesson4/BitEA.cpp b/eo/tutorial/Lesson4/BitEA.cpp
index 9fa1fd663..31a22ae3c 100644
--- a/eo/tutorial/Lesson4/BitEA.cpp
+++ b/eo/tutorial/Lesson4/BitEA.cpp
@@ -52,7 +52,7 @@ int main(int argc, char* argv[])
   //// GO
   ///////
   // evaluate intial population AFTER help and status in case it takes time
-  apply(eval, pop);
+  apply<EOT>(eval, pop);
   // print it out
   cout << "Initial Population\n";
   pop.sortedPrintOn(cout);
diff --git a/eo/tutorial/Lesson4/ESEA.cpp b/eo/tutorial/Lesson4/ESEA.cpp
index eeb0615af..1c1bd30cf 100644
--- a/eo/tutorial/Lesson4/ESEA.cpp
+++ b/eo/tutorial/Lesson4/ESEA.cpp
@@ -109,7 +109,7 @@ void runAlgorithm(EOT, eoParser& _parser, eoState& _state)
   // initialize the population - and evaluate
   // yes, this is representation indepedent once you have an eoInit
   eoPop<EOT>& pop   = make_pop(_parser, _state, init);
-  apply(eval, pop);
+  apply<EOT>(eval, pop);
 
   // stopping criteria
   eoContinue<EOT> & term = make_continue(_parser, _state, eval);
diff --git a/eo/tutorial/Lesson4/RealEA.cpp b/eo/tutorial/Lesson4/RealEA.cpp
index 09e7ced51..8002136c0 100644
--- a/eo/tutorial/Lesson4/RealEA.cpp
+++ b/eo/tutorial/Lesson4/RealEA.cpp
@@ -53,7 +53,7 @@ int main(int argc, char* argv[])
   //// GO
   ///////
   // evaluate intial population AFTER help and status in case it takes time
-  apply(eval, pop);
+  apply<EOT>(eval, pop);
   // print it out
   cout << "Initial Population\n";
   pop.sortedPrintOn(cout);