diff --git a/components/libc/minilibc/SConscript b/components/libc/minilibc/SConscript
index 8eb7e0b58e78e7b536d0dce81940a7b9410e0c29..d0cc5059c57319e85b2530c07bd22840a4c2b306 100644
--- a/components/libc/minilibc/SConscript
+++ b/components/libc/minilibc/SConscript
@@ -3,6 +3,11 @@ from building import *
 
 src	= Glob('*.c')
 CPPPATH = [RTT_ROOT + '/components/libc/minilibc']
-group = DefineGroup('minilibc', src, depend = ['RT_USING_MINILIBC'], CPPPATH = CPPPATH)
+CPPDEFINES = ['RT_USING_MINILIBC']
+group = DefineGroup('minilibc', src, 
+	depend = ['RT_USING_MINILIBC'], 
+	CPPPATH = CPPPATH,
+	CPPDEFINES = CPPDEFINES
+	)
 
 Return('group')