diff --git a/Makefile b/Makefile
index f5816d1..d0fb1f5 100644
--- a/Makefile
+++ b/Makefile
@@ -39,7 +39,8 @@ BINHEX=outp.hex
 MCFLAGS=-mcpu=cortex-m4 -mthumb -mlittle-endian \
 -mfpu=fpv4-sp-d16 -mfloat-abi=hard -mthumb-interwork
 # COMPILE FLAGS
-DEFS=-DUSE_STDPERIPH_DRIVER -DSTM32F4XX -DSTM32F407VG
+DEFS=-DUSE_STDPERIPH_DRIVER -DSTM32F4XX -DSTM32F40_41xxx -DHSE_VALUE=12000000
+#DEFS=-DUSE_STDPERIPH_DRIVER -DSTM32F4XX -DSTM32F446xx -DHSE_VALUE=12000000
 CFLAGS=-c $(MCFLAGS) $(DEFS) $(INCLUDES)
 CXXFLAGS=-c $(MCFLAGS) $(DEFS) $(INCLUDES)
 # LINKER FLAGS