diff --git a/Packages/Triangulation_3/test/Triangulation_3/Makefile b/Packages/Triangulation_3/test/Triangulation_3/Makefile
index 8ac96054c73..4a0e4c8ebf1 100644
--- a/Packages/Triangulation_3/test/Triangulation_3/Makefile
+++ b/Packages/Triangulation_3/test/Triangulation_3/Makefile
@@ -17,6 +17,7 @@ CXXFLAGS = \
 	 $(TESTSUITE_CXXFLAGS) \
 	-W -Wall \
         -DCGAL_NO_DEPRECATED_CODE \
+	-DCGAL_CHECK_EXPENSIVE \
 	-g
 
 	# -fprofile-arcs -ftest-coverage # pour Gcov