diff --git a/kernel/Makefile b/kernel/Makefile
index ae199c5ec..4a3d3160f 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -15,7 +15,7 @@ LDADD+=	-ltimers -lsys
 .if ${COMPILER_TYPE} == "ack"
 LDFLAGS+= -.o
 .elif ${COMPILER_TYPE} == "gnu"
-CPPFLAGS+= -fno-builtin -ffreestanding -fno-stack-protector
+CPPFLAGS+= -ffreestanding -fno-stack-protector
 LDFLAGS+= -T arch/${ARCH}/kernel.lds
 LDFLAGS+= -nostdlib -L/usr/gnu/lib
 CFLAGS+=-march=i386
diff --git a/share/mk/bsd.gcc.mk b/share/mk/bsd.gcc.mk
index 3a2b0185d..6554b76e2 100644
--- a/share/mk/bsd.gcc.mk
+++ b/share/mk/bsd.gcc.mk
@@ -1 +1,2 @@
 AFLAGS+=-D__ASSEMBLY__ -D_EM_WSIZE=4 -D__minix
+CFLAGS+= -fno-builtin