diff --git a/litex/soc/software/libcompiler_rt/Makefile b/litex/soc/software/libcompiler_rt/Makefile
index 35a8b98ec..81d6a4bf4 100644
--- a/litex/soc/software/libcompiler_rt/Makefile
+++ b/litex/soc/software/libcompiler_rt/Makefile
@@ -1,7 +1,7 @@
 include ../include/generated/variables.mak
 include $(SOC_DIRECTORY)/software/common.mak
 
-ifeq ($(CPU),big)
+ifeq ($(CPUENDIANNESS),big)
 CFLAGS+=-D_YUGA_LITTLE_ENDIAN=0 -D_YUGA_BIG_ENDIAN=1 -Wno-missing-prototypes
 else
 CFLAGS+=-D_YUGA_LITTLE_ENDIAN=1 -D_YUGA_BIG_ENDIAN=0 -Wno-missing-prototypes