diff --git a/Makefile b/Makefile
index dec32e5dc2..b709d14a9d 100644
--- a/Makefile
+++ b/Makefile
@@ -126,6 +126,7 @@ ARCH-$(CONFIG_ARCH_X86)     := i386
 ifneq ($(INNER_SCANBUILD),y)
 CC := $(CC_$(ARCH-y))
 endif
+CPP := $(CPP_$(ARCH-y))
 AS := $(AS_$(ARCH-y))
 LD := $(LD_$(ARCH-y))
 NM := $(NM_$(ARCH-y))
diff --git a/src/arch/x86/Makefile.inc b/src/arch/x86/Makefile.inc
index b3b82b998c..dee56c5345 100644
--- a/src/arch/x86/Makefile.inc
+++ b/src/arch/x86/Makefile.inc
@@ -427,6 +427,7 @@ seabios:
 			HOSTCC="$(HOSTCC)" \
 			CC="$(CC)" LD="$(LD)" OBJDUMP="$(OBJDUMP)" \
 			OBJCOPY="$(OBJCOPY)" STRIP="$(STRIP)" \
+			AS="$(AS)" CPP="$(CPP)" \
 			CONFIG_SEABIOS_MASTER=$(CONFIG_SEABIOS_MASTER) \
 			CONFIG_SEABIOS_STABLE=$(CONFIG_SEABIOS_STABLE) \
 			OUT=$(abspath $(obj)) IASL="$(IASL)"
diff --git a/util/xcompile/xcompile b/util/xcompile/xcompile
index de6084d8fa..5388889776 100644
--- a/util/xcompile/xcompile
+++ b/util/xcompile/xcompile
@@ -117,6 +117,7 @@ report_arch_toolchain() {
 	cat <<EOF
 # elf${TWIDTH}-${TBFDARCH} toolchain (${GCCPREFIX}gcc)
 CC_${TARCH}:=${GCCPREFIX}gcc ${CFLAGS}
+CPP_${TARCH}:=${GCCPREFIX}cpp
 AS_${TARCH}:=${GCCPREFIX}as ${ASFLAGS}
 LD_${TARCH}:=${GCCPREFIX}ld${LINKER_SUFFIX} ${LDFLAGS}
 NM_${TARCH}:=${GCCPREFIX}nm