diff --git a/gnu/usr.bin/cc/Makefile.tgt b/gnu/usr.bin/cc/Makefile.tgt
index 8800a0d433d..4ba1c68817d 100644
--- a/gnu/usr.bin/cc/Makefile.tgt
+++ b/gnu/usr.bin/cc/Makefile.tgt
@@ -15,4 +15,5 @@ GCC_CPU=	rs6000
 .elif ${TARGET_ARCH} == "sparc64"
 GCC_CPU=	sparc
 TARGET_CPU_DEFAULT= TARGET_CPU_ultrasparc
+CFLAGS+=	-DTARGET_CPU_DEFAULT=${TARGET_CPU_DEFAULT}
 .endif