diff --git a/Demo/PPC405_Xilinx_Virtex4_GCC/system_incl.make b/Demo/PPC405_Xilinx_Virtex4_GCC/system_incl.make
index d24c39825..078a3d30d 100644
--- a/Demo/PPC405_Xilinx_Virtex4_GCC/system_incl.make
+++ b/Demo/PPC405_Xilinx_Virtex4_GCC/system_incl.make
@@ -116,7 +116,7 @@ RTOSDEMO_HEADERS = RTOSDemo/FreeRTOSConfig.h
 RTOSDEMO_CC = powerpc-eabi-gcc
 RTOSDEMO_CC_SIZE = powerpc-eabi-size
 RTOSDEMO_CC_OPT = -O0
-RTOSDEMO_CFLAGS = -D GCC_PPC405 -mregnames -Xlinker -Map=rtosdemo.map
+RTOSDEMO_CFLAGS = -D GCC_PPC405 -mregnames -Xlinker -Map=rtosdemo.map -Wall
 RTOSDEMO_CC_SEARCH = # -B
 RTOSDEMO_LIBPATH = -L./ppc405_0/lib/ # -L
 RTOSDEMO_INCLUDES = -I./ppc405_0/include/  -IRTOSDemo/   -I. -I./RTOSDemo/ -I../Common/include/ -I../../Source/include/ -I./ppc405_0/include/ -I./ppc405_0/include