diff --git a/makefiles/Makefile.cpp.mk b/makefiles/Makefile.cpp.mk
index 490b2b7ae1..966a0f1ac7 100755
--- a/makefiles/Makefile.cpp.mk
+++ b/makefiles/Makefile.cpp.mk
@@ -480,7 +480,7 @@ test_cc_cpp: \
 #	$(MAKE) run SOURCE=examples/cpp/frequency_assignment_problem.cc  # Need data file
 #	$(MAKE) run SOURCE=examples/cpp/pdptw.cc ARGS="--pdp_file examples/data/pdptw/LC1_2_1.txt" # Fails on windows...
 	$(MAKE) run SOURCE=examples/cpp/shift_minimization_sat.cc  ARGS="--input examples/data/shift_scheduling/minimization/data_1_23_40_66.dat"
-	$(MAKE) run DEBUG=-DNDEBUG\
+	$(MAKE) run \
  SOURCE=examples/cpp/solve.cc \
  ARGS="--input examples/data/tests/test2.mps"
 
diff --git a/makefiles/Makefile.gen.mk b/makefiles/Makefile.gen.mk
index 8c6e859c68..94689a3a98 100644
--- a/makefiles/Makefile.gen.mk
+++ b/makefiles/Makefile.gen.mk
@@ -509,7 +509,7 @@ objs/lp_data/mps_reader.$O: ortools/lp_data/mps_reader.cc \
  ortools/util/return_macros.h ortools/lp_data/sparse_column.h \
  ortools/lp_data/sparse_vector.h ortools/graph/iterators.h \
  ortools/util/fp_utils.h | $(OBJ_DIR)/lp_data
-	$(CCC) -DNDEBUG $(DEPENDENCIES_INC) -c $(SRC_DIR)$Sortools$Slp_data$Smps_reader.cc $(OBJ_OUT)$(OBJ_DIR)$Slp_data$Smps_reader.$O
+	$(CCC) $(CFLAGS) -c $(SRC_DIR)$Sortools$Slp_data$Smps_reader.cc $(OBJ_OUT)$(OBJ_DIR)$Slp_data$Smps_reader.$O
 
 objs/lp_data/proto_utils.$O: ortools/lp_data/proto_utils.cc \
  ortools/lp_data/proto_utils.h \