diff --git a/eo/tutorial/Lesson4/ESEA.cpp b/eo/tutorial/Lesson4/ESEA.cpp
index f673eaf78..adf2aace4 100644
--- a/eo/tutorial/Lesson4/ESEA.cpp
+++ b/eo/tutorial/Lesson4/ESEA.cpp
@@ -2,7 +2,7 @@
 
 #ifdef _MSC_VER
 #pragma warning(disable:4786)
-#endif 
+#endif
 
 #include <algorithm>
 #include <string>
diff --git a/eo/tutorial/Lesson4/Makefile b/eo/tutorial/Lesson4/Makefile
index 9a02e0713..3585354d8 100644
--- a/eo/tutorial/Lesson4/Makefile
+++ b/eo/tutorial/Lesson4/Makefile
@@ -3,7 +3,7 @@
 .cpp.o: ; c++ -DPACKAGE=\"eo\" -DVERSION=\"0.9.1\" -I. -I../../src -Wall -g -c $*.cpp
 
 
-ALL = BitEA RealEA
+ALL = BitEA RealEA ESEA
 
 lesson3 : $(ALL)