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
@@ -1,7 +1,7 @@
 SRCS+=	__vdso_gettc.c \
 	sched_getcpu_gen.c
 
-MDASM= Ovfork.S cerror.S syscall.S
+MDASM= vfork.S cerror.S syscall.S
 
 # Don't generate default code for these syscalls:
 NOASM+=	vfork.o
diff --git a/lib/libc/arm/sys/Ovfork.S b/lib/libc/arm/sys/vfork.S
rename from lib/libc/arm/sys/Ovfork.S
rename to lib/libc/arm/sys/vfork.S
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
@@ -2,7 +2,7 @@
 	i386_set_fsbase.c i386_set_gsbase.c i386_set_ioperm.c i386_set_ldt.c \
 	i386_clr_watch.c i386_set_watch.c i386_vm86.c
 
-MDASM=	Ovfork.S cerror.S getcontext.S syscall.S
+MDASM=	vfork.S cerror.S getcontext.S syscall.S
 
 NOASM+=	vfork.o
 
diff --git a/lib/libc/i386/sys/Ovfork.S b/lib/libc/i386/sys/vfork.S
rename from lib/libc/i386/sys/Ovfork.S
rename to lib/libc/i386/sys/vfork.S