diff --git a/libc/arch-x86/syscalls.mk b/libc/arch-x86/syscalls.mk
index c210b21..e8c6a77 100644
--- a/libc/arch-x86/syscalls.mk
+++ b/libc/arch-x86/syscalls.mk
@@ -44,8 +44,8 @@
 syscall_src += arch-x86/syscalls/acct.S
 syscall_src += arch-x86/syscalls/read.S
 syscall_src += arch-x86/syscalls/write.S
-syscall_src += arch-x86/syscalls/__pread64.S
-syscall_src += arch-x86/syscalls/__pwrite64.S
+syscall_src += arch-x86/syscalls/pread64.S
+syscall_src += arch-x86/syscalls/pwrite64.S
 syscall_src += arch-x86/syscalls/__open.S
 syscall_src += arch-x86/syscalls/__openat.S
 syscall_src += arch-x86/syscalls/close.S
@@ -73,6 +73,7 @@
 syscall_src += arch-x86/syscalls/dup2.S
 syscall_src += arch-x86/syscalls/select.S
 syscall_src += arch-x86/syscalls/ftruncate.S
+syscall_src += arch-x86/syscalls/ftruncate64.S
 syscall_src += arch-x86/syscalls/getdents.S
 syscall_src += arch-x86/syscalls/fsync.S
 syscall_src += arch-x86/syscalls/fdatasync.S
diff --git a/libc/arch-x86/syscalls/ftruncate64.S b/libc/arch-x86/syscalls/ftruncate64.S
new file mode 100644
index 0000000..66835ab
--- /dev/null
+++ b/libc/arch-x86/syscalls/ftruncate64.S
@@ -0,0 +1,29 @@
+/* autogenerated by gensyscalls.py */
+#include <sys/linux-syscalls.h>
+
+    .text
+    .type ftruncate64, @function
+    .globl ftruncate64
+    .align 4
+
+ftruncate64:
+    pushl   %ebx
+    pushl   %ecx
+    pushl   %edx
+    mov     16(%esp), %ebx
+    mov     20(%esp), %ecx
+    mov     24(%esp), %edx
+    movl    $__NR_ftruncate64, %eax
+    int     $0x80
+    cmpl    $-129, %eax
+    jb      1f
+    negl    %eax
+    pushl   %eax
+    call    __set_errno
+    addl    $4, %esp
+    orl     $-1, %eax
+1:
+    popl    %edx
+    popl    %ecx
+    popl    %ebx
+    ret
diff --git a/libc/arch-x86/syscalls/__pread64.S b/libc/arch-x86/syscalls/pread64.S
similarity index 90%
rename from libc/arch-x86/syscalls/__pread64.S
rename to libc/arch-x86/syscalls/pread64.S
index 3114673..eb004a9 100644
--- a/libc/arch-x86/syscalls/__pread64.S
+++ b/libc/arch-x86/syscalls/pread64.S
@@ -2,11 +2,11 @@
 #include <sys/linux-syscalls.h>
 
     .text
-    .type __pread64, @function
-    .globl __pread64
+    .type pread64, @function
+    .globl pread64
     .align 4
 
-__pread64:
+pread64:
     pushl   %ebx
     pushl   %ecx
     pushl   %edx
diff --git a/libc/arch-x86/syscalls/__pwrite64.S b/libc/arch-x86/syscalls/pwrite64.S
similarity index 90%
rename from libc/arch-x86/syscalls/__pwrite64.S
rename to libc/arch-x86/syscalls/pwrite64.S
index 28f6536..01389f8 100644
--- a/libc/arch-x86/syscalls/__pwrite64.S
+++ b/libc/arch-x86/syscalls/pwrite64.S
@@ -2,11 +2,11 @@
 #include <sys/linux-syscalls.h>
 
     .text
-    .type __pwrite64, @function
-    .globl __pwrite64
+    .type pwrite64, @function
+    .globl pwrite64
     .align 4
 
-__pwrite64:
+pwrite64:
     pushl   %ebx
     pushl   %ecx
     pushl   %edx