diff --git a/libc/syscall_to_function.h b/libc/syscall_to_function.h
index 87cd27df7e..0f1172cae3 100644
--- a/libc/syscall_to_function.h
+++ b/libc/syscall_to_function.h
@@ -2,33 +2,21 @@
 #include <unistd.h>
 #include <errno.h>
 
-#define sys_open(filename, flags, ...) (open(filename, flags __VA_OPT__(,) __VA_ARGS__))
-
-#define __OSV_TO_FUNCTION_SYS_open(filename, flags, ...) (open(filename, flags __VA_OPT__(,) __VA_ARGS__))
-
-#define __OSV_TO_FUNCTION_SYS_close(fd) (close(fd))
-
-#define __OSV_TO_FUNCTION_SYS_lseek(file, off, whence) (lseek(file, off, whence))
-
-#define __OSV_TO_FUNCTION_SYS_fcntl(fd, cmd, ...) (fcntl(fd, cmd __VA_OPT__(,) __VA_ARGS__))
-
-#define __OSV_TO_FUNCTION_SYS_clock_gettime(c, t, x) (clock_gettime(c, t))
-
-#define __OSV_TO_FUNCTION_SYS_access(p, i) (access(p, i))
-
-#define __OSV_TO_FUNCTION_SYS_ioctl(fd, cmd, args) (ioctl(fd, cmd, args))
-
-#define __OSV_TO_FUNCTION_SYS_fstat(fd, st) (fstat(fd, st))
-
-#define __OSV_TO_FUNCTION_SYS_lstat(fd, st) (lstat(fd, st))
-
-#define __OSV_TO_FUNCTION_SYS_unlink(path) (unlink(path))
-
-#define __OSV_TO_FUNCTION_SYS_rmdir(path) (rmdir(path))
-
-#define __OSV_TO_FUNCTION_SYS_readv(fd, cmd, args) (readv(fd, cmd, args))
-
-#define __OSV_TO_FUNCTION_SYS_writev(fd, cmd, args) (writev(fd, cmd, args))
+#define sys_open open
+
+#define __OSV_TO_FUNCTION_SYS_open          open
+#define __OSV_TO_FUNCTION_SYS_close         close
+#define __OSV_TO_FUNCTION_SYS_lseek         lseek
+#define __OSV_TO_FUNCTION_SYS_fcntl         fcntl
+#define __OSV_TO_FUNCTION_SYS_clock_gettime clock_gettime
+#define __OSV_TO_FUNCTION_SYS_access        access
+#define __OSV_TO_FUNCTION_SYS_ioctl         ioctl
+#define __OSV_TO_FUNCTION_SYS_fstat         fstat
+#define __OSV_TO_FUNCTION_SYS_lstat         lstat
+#define __OSV_TO_FUNCTION_SYS_unlink        unlink
+#define __OSV_TO_FUNCTION_SYS_rmdir         rmdir
+#define __OSV_TO_FUNCTION_SYS_readv         readv
+#define __OSV_TO_FUNCTION_SYS_writev        writev
 
 #undef __syscall
 #define __syscall(sys_number, ...) (__OSV_TO_FUNCTION_##sys_number(__VA_ARGS__) < 0 ? -errno : 0)