diff --git a/sys/boot/i386/boot2/Makefile b/sys/boot/i386/boot2/Makefile
index ad392ebca25..bd2f3df967e 100644
--- a/sys/boot/i386/boot2/Makefile
+++ b/sys/boot/i386/boot2/Makefile
@@ -38,8 +38,6 @@ CFLAGS=	-fomit-frame-pointer \
 	-Winline
 
 CFLAGS.gcc+=	-Os \
-		-fno-guess-branch-probability \
-		-fno-unit-at-a-time \
 		--param max-inline-insns-single=100
 .if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} <= 40201
 CFLAGS.gcc+=   -mno-align-long-strings