diff --git a/libc/arch-mips64/syscalls/umask.S b/libc/arch-mips64/syscalls/umask.S
new file mode 100644
index 0000000..168ff9c
--- /dev/null
+++ b/libc/arch-mips64/syscalls/umask.S
@@ -0,0 +1,31 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <asm/unistd.h>
+#include <machine/asm.h>
+#include <machine/regdef.h>
+    .text
+    .globl umask
+    .align 4
+    .ent umask
+
+umask:
+    .set push
+    .set noreorder
+    li v0, __NR_umask
+    syscall
+    bnez a3, 1f
+    move a0, v0
+    j ra
+    nop
+1:
+    move t0, ra
+    bal     2f
+    nop
+2:
+    .cpsetup ra, t1, 2b
+    LA t9,__set_errno
+    .cpreturn
+    j t9
+    move ra, t0
+    .set pop
+    .end umask