diff --git a/sys/conf/Makefile.arm b/sys/conf/Makefile.arm
index 9fb1ebe047e..ca12fe6922e 100644
--- a/sys/conf/Makefile.arm
+++ b/sys/conf/Makefile.arm
@@ -35,6 +35,12 @@ S=	../../..
 
 SYSTEM_LD:= ${SYSTEM_LD:$S/conf/ldscript.$M=ldscript.$M}
 SYSTEM_DEP:= ${SYSTEM_DEP:$S/conf/ldscript.$M=ldscript.$M}
+
+.if defined(ARM_BIG_ENDIAN)
+CC += -mbig-endian
+SYSTEM_LD += -EB
+.endif
+
 %BEFORE_DEPEND
 
 %OBJS