diff --git a/libc/SYSCALLS.TXT b/libc/SYSCALLS.TXT
index 014d554..128ec6b 100644
--- a/libc/SYSCALLS.TXT
+++ b/libc/SYSCALLS.TXT
@@ -303,6 +303,9 @@
 
 int __set_tid_address:set_tid_address(int*)  all
 
+int setfsgid(gid_t)  all
+int setfsuid(uid_t)  all
+
 pid_t wait4(pid_t, int*, int, struct rusage*)  all
 int __waitid:waitid(int, pid_t, struct siginfo_t*, int, void*)  all
 
diff --git a/libc/arch-arm/syscalls/setfsgid.S b/libc/arch-arm/syscalls/setfsgid.S
new file mode 100644
index 0000000..e36e6ea
--- /dev/null
+++ b/libc/arch-arm/syscalls/setfsgid.S
@@ -0,0 +1,14 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(setfsgid)
+    mov     ip, r7
+    ldr     r7, =__NR_setfsgid
+    swi     #0
+    mov     r7, ip
+    cmn     r0, #(MAX_ERRNO + 1)
+    bxls    lr
+    neg     r0, r0
+    b       __set_errno
+END(setfsgid)
diff --git a/libc/arch-arm/syscalls/setfsuid.S b/libc/arch-arm/syscalls/setfsuid.S
new file mode 100644
index 0000000..e3c9c00
--- /dev/null
+++ b/libc/arch-arm/syscalls/setfsuid.S
@@ -0,0 +1,14 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(setfsuid)
+    mov     ip, r7
+    ldr     r7, =__NR_setfsuid
+    swi     #0
+    mov     r7, ip
+    cmn     r0, #(MAX_ERRNO + 1)
+    bxls    lr
+    neg     r0, r0
+    b       __set_errno
+END(setfsuid)
diff --git a/libc/arch-arm64/syscalls/setfsgid.S b/libc/arch-arm64/syscalls/setfsgid.S
new file mode 100644
index 0000000..d2f29ab
--- /dev/null
+++ b/libc/arch-arm64/syscalls/setfsgid.S
@@ -0,0 +1,14 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(setfsgid)
+    mov     x8, __NR_setfsgid
+    svc     #0
+
+    cmn     x0, #(MAX_ERRNO + 1)
+    cneg    x0, x0, hi
+    b.hi    __set_errno
+
+    ret
+END(setfsgid)
diff --git a/libc/arch-arm64/syscalls/setfsuid.S b/libc/arch-arm64/syscalls/setfsuid.S
new file mode 100644
index 0000000..852f97c
--- /dev/null
+++ b/libc/arch-arm64/syscalls/setfsuid.S
@@ -0,0 +1,14 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(setfsuid)
+    mov     x8, __NR_setfsuid
+    svc     #0
+
+    cmn     x0, #(MAX_ERRNO + 1)
+    cneg    x0, x0, hi
+    b.hi    __set_errno
+
+    ret
+END(setfsuid)
diff --git a/libc/arch-mips/syscalls/setfsgid.S b/libc/arch-mips/syscalls/setfsgid.S
new file mode 100644
index 0000000..6a59565
--- /dev/null
+++ b/libc/arch-mips/syscalls/setfsgid.S
@@ -0,0 +1,19 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(setfsgid)
+    .set noreorder
+    .cpload t9
+    li v0, __NR_setfsgid
+    syscall
+    bnez a3, 1f
+    move a0, v0
+    j ra
+    nop
+1:
+    la t9,__set_errno
+    j t9
+    nop
+    .set reorder
+END(setfsgid)
diff --git a/libc/arch-mips/syscalls/setfsuid.S b/libc/arch-mips/syscalls/setfsuid.S
new file mode 100644
index 0000000..1c2317a
--- /dev/null
+++ b/libc/arch-mips/syscalls/setfsuid.S
@@ -0,0 +1,19 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(setfsuid)
+    .set noreorder
+    .cpload t9
+    li v0, __NR_setfsuid
+    syscall
+    bnez a3, 1f
+    move a0, v0
+    j ra
+    nop
+1:
+    la t9,__set_errno
+    j t9
+    nop
+    .set reorder
+END(setfsuid)
diff --git a/libc/arch-mips64/syscalls/setfsgid.S b/libc/arch-mips64/syscalls/setfsgid.S
new file mode 100644
index 0000000..7f75ed9
--- /dev/null
+++ b/libc/arch-mips64/syscalls/setfsgid.S
@@ -0,0 +1,25 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(setfsgid)
+    .set push
+    .set noreorder
+    li v0, __NR_setfsgid
+    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(setfsgid)
diff --git a/libc/arch-mips64/syscalls/setfsuid.S b/libc/arch-mips64/syscalls/setfsuid.S
new file mode 100644
index 0000000..4cab9d4
--- /dev/null
+++ b/libc/arch-mips64/syscalls/setfsuid.S
@@ -0,0 +1,25 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(setfsuid)
+    .set push
+    .set noreorder
+    li v0, __NR_setfsuid
+    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(setfsuid)
diff --git a/libc/arch-x86/syscalls/setfsgid.S b/libc/arch-x86/syscalls/setfsgid.S
new file mode 100644
index 0000000..fa7a5c5
--- /dev/null
+++ b/libc/arch-x86/syscalls/setfsgid.S
@@ -0,0 +1,21 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(setfsgid)
+    pushl   %ebx
+    .cfi_def_cfa_offset 8
+    .cfi_rel_offset ebx, 0
+    mov     8(%esp), %ebx
+    movl    $__NR_setfsgid, %eax
+    int     $0x80
+    cmpl    $-MAX_ERRNO, %eax
+    jb      1f
+    negl    %eax
+    pushl   %eax
+    call    __set_errno
+    addl    $4, %esp
+1:
+    popl    %ebx
+    ret
+END(setfsgid)
diff --git a/libc/arch-x86/syscalls/setfsuid.S b/libc/arch-x86/syscalls/setfsuid.S
new file mode 100644
index 0000000..5856a16
--- /dev/null
+++ b/libc/arch-x86/syscalls/setfsuid.S
@@ -0,0 +1,21 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(setfsuid)
+    pushl   %ebx
+    .cfi_def_cfa_offset 8
+    .cfi_rel_offset ebx, 0
+    mov     8(%esp), %ebx
+    movl    $__NR_setfsuid, %eax
+    int     $0x80
+    cmpl    $-MAX_ERRNO, %eax
+    jb      1f
+    negl    %eax
+    pushl   %eax
+    call    __set_errno
+    addl    $4, %esp
+1:
+    popl    %ebx
+    ret
+END(setfsuid)
diff --git a/libc/arch-x86_64/syscalls/setfsgid.S b/libc/arch-x86_64/syscalls/setfsgid.S
new file mode 100644
index 0000000..e9f50b8
--- /dev/null
+++ b/libc/arch-x86_64/syscalls/setfsgid.S
@@ -0,0 +1,15 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(setfsgid)
+    movl    $__NR_setfsgid, %eax
+    syscall
+    cmpq    $-MAX_ERRNO, %rax
+    jb      1f
+    negl    %eax
+    movl    %eax, %edi
+    call    __set_errno
+1:
+    ret
+END(setfsgid)
diff --git a/libc/arch-x86_64/syscalls/setfsuid.S b/libc/arch-x86_64/syscalls/setfsuid.S
new file mode 100644
index 0000000..cfdb86c
--- /dev/null
+++ b/libc/arch-x86_64/syscalls/setfsuid.S
@@ -0,0 +1,15 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(setfsuid)
+    movl    $__NR_setfsuid, %eax
+    syscall
+    cmpq    $-MAX_ERRNO, %rax
+    jb      1f
+    negl    %eax
+    movl    %eax, %edi
+    call    __set_errno
+1:
+    ret
+END(setfsuid)
diff --git a/libc/include/sys/fsuid.h b/libc/include/sys/fsuid.h
index bc47e3d..03355b7 100644
--- a/libc/include/sys/fsuid.h
+++ b/libc/include/sys/fsuid.h
@@ -25,6 +25,7 @@
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
+
 #ifndef _SYS_FSUID_H_
 #define _SYS_FSUID_H_
 
@@ -33,10 +34,8 @@
 
 __BEGIN_DECLS
 
-#if 0 /* MISSING FROM BIONIC */
 extern int setfsuid(uid_t);
 extern int setfsgid(gid_t);
-#endif /* MISSING */
 
 __END_DECLS