diff --git a/lib/libc/aarch64/sys/Makefile.inc b/lib/libc/aarch64/sys/Makefile.inc
--- a/lib/libc/aarch64/sys/Makefile.inc
+++ b/lib/libc/aarch64/sys/Makefile.inc
@@ -8,5 +8,4 @@
 	vfork.S
 
 # Don't generate default code for these syscalls:
-NOASM+=	sbrk.o \
-	vfork.o
+NOASM+=	vfork.o
diff --git a/lib/libc/amd64/sys/Makefile.inc b/lib/libc/amd64/sys/Makefile.inc
--- a/lib/libc/amd64/sys/Makefile.inc
+++ b/lib/libc/amd64/sys/Makefile.inc
@@ -7,4 +7,4 @@
 MDASM=	vfork.S cerror.S getcontext.S
 
 # Don't generate default code for these syscalls:
-NOASM+=	sbrk.o vfork.o
+NOASM+=	vfork.o
diff --git a/lib/libc/arm/sys/Makefile.inc b/lib/libc/arm/sys/Makefile.inc
--- a/lib/libc/arm/sys/Makefile.inc
+++ b/lib/libc/arm/sys/Makefile.inc
@@ -4,4 +4,4 @@
 MDASM= Ovfork.S cerror.S syscall.S
 
 # Don't generate default code for these syscalls:
-NOASM+=	sbrk.o vfork.o
+NOASM+=	vfork.o
diff --git a/lib/libc/i386/sys/Makefile.inc b/lib/libc/i386/sys/Makefile.inc
--- a/lib/libc/i386/sys/Makefile.inc
+++ b/lib/libc/i386/sys/Makefile.inc
@@ -4,7 +4,7 @@
 
 MDASM=	Ovfork.S cerror.S getcontext.S syscall.S
 
-NOASM+=	sbrk.o vfork.o
+NOASM+=	vfork.o
 
 MAN+=	i386_get_ioperm.2 i386_get_ldt.2 i386_vm86.2
 MAN+=	i386_set_watch.3
diff --git a/lib/libc/riscv/sys/Makefile.inc b/lib/libc/riscv/sys/Makefile.inc
--- a/lib/libc/riscv/sys/Makefile.inc
+++ b/lib/libc/riscv/sys/Makefile.inc
@@ -6,4 +6,4 @@
 	vfork.S
 
 # Don't generate default code for these syscalls:
-NOASM+=	sbrk.o vfork.o
+NOASM+=	vfork.o
diff --git a/lib/libc/sys/Makefile.inc b/lib/libc/sys/Makefile.inc
--- a/lib/libc/sys/Makefile.inc
+++ b/lib/libc/sys/Makefile.inc
@@ -18,6 +18,7 @@
 #
 NOASM=	exit.o \
 	getlogin.o \
+	sbrk.o \
 	sstk.o \
 	yield.o
 PSEUDO=	_exit.o \