diff --git a/radio/src/Makefile b/radio/src/Makefile
index ec06cddbc..be8eb81f8 100644
--- a/radio/src/Makefile
+++ b/radio/src/Makefile
@@ -1585,7 +1585,7 @@ ifeq ($(SIMU_DISKIO), YES)
 endif
 
 simu: $(LUADEP) stamp_header allsimusrc.cpp Makefile simu.cpp targets/simu/simpgmspace.cpp *.h tra lbm eeprom.bin
-	g++ $(CPPFLAGS) $(INCFLAGS) simu.cpp allsimusrc.cpp $(LUASRC) targets/simu/simpgmspace.cpp -MD $(SIMUDEFS) -O0 -o simu $(FOXINC) $(FOXLIB) $(AUDIOINC) $(AUDIOLIB) -pthread -fexceptions
+	g++ $(CPPFLAGS) $(SIMUCPPFLAGS) $(INCFLAGS) simu.cpp allsimusrc.cpp $(LUASRC) targets/simu/simpgmspace.cpp -MD $(SIMUDEFS) -O0 -o simu $(FOXINC) $(FOXLIB) $(AUDIOINC) $(AUDIOLIB) -pthread -fexceptions
 
 eeprom.bin:
 	dd if=/dev/zero of=$@ bs=1 count=2048
@@ -1773,5 +1773,5 @@ gtest_main.a : gtest-all.o gtest_main.o
 GTEST_TESTS_SRCS = $(shell find tests/ -type f -name '*.cpp')
 
 gtests: allsimusrc.cpp $(GTEST_TESTS_SRCS) targets/simu/simpgmspace.cpp *.h gtest_main.a
-	g++ -std=gnu++0x $(CPPFLAGS) allsimusrc.cpp $(LUASRC) $(GTEST_TESTS_SRCS) targets/simu/simpgmspace.cpp -I$(GTEST_DIR) ${INCFLAGS} -I$(GTEST_DIR)/include -o gtests -lpthread -MD -DSIMU -lQtCore -lQtGui gtest_main.a -fexceptions
+	g++ -std=gnu++0x $(CPPFLAGS) $(SIMUCPPFLAGS) allsimusrc.cpp $(LUASRC) $(GTEST_TESTS_SRCS) targets/simu/simpgmspace.cpp -I$(GTEST_DIR) ${INCFLAGS} -I$(GTEST_DIR)/include -o gtests -lpthread -MD -DSIMU -lQtCore -lQtGui gtest_main.a -fexceptions