diff --git a/corev_apu/fpga/src/bootrom/Makefile b/corev_apu/fpga/src/bootrom/Makefile
index b8a980945..f9e9fc3e2 100644
--- a/corev_apu/fpga/src/bootrom/Makefile
+++ b/corev_apu/fpga/src/bootrom/Makefile
@@ -17,8 +17,10 @@ UART_BITRATE ?= 115200
 HAS_ETHERNET ?= 1
 endif
 
-CC ?= $(RISCV)/bin/${CROSSCOMPILE}gcc
-OBJCOPY ?= $(RISCV)/bin/$(CROSSCOMPILE)objcopy
+ifeq ($(CC),cc)
+  CC = $(RISCV)/bin/${CROSSCOMPILE}gcc
+  OBJCOPY = $(RISCV)/bin/$(CROSSCOMPILE)objcopy
+endif
 SED = sed
 PLATFORM_DEFINES = -DCLOCK_FREQUENCY=$(CLOCK_FREQUENCY) -DUART_BITRATE=$(UART_BITRATE) -D$(PLATFORM)