diff --git a/libc-test/build.rs b/libc-test/build.rs
index 8e0a9cf4ad94d..6252d8523c2d5 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -4210,6 +4210,9 @@ fn test_linux(target: &str) {
                 true
             }
 
+            // FIXME: Requires >= 6.6 kernel headers.
+            "SYS_fchmodat2" => true,
+
             // FIXME: seems to not be available all the time (from <include/linux/sched.h>:
             "PF_VCPU"
             | "PF_IDLE"
diff --git a/src/unix/linux_like/linux/gnu/b32/x86/mod.rs b/src/unix/linux_like/linux/gnu/b32/x86/mod.rs
index 27f477bb48f85..161e54d13df9d 100644
--- a/src/unix/linux_like/linux/gnu/b32/x86/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b32/x86/mod.rs
@@ -1044,6 +1044,7 @@ pub const SYS_memfd_secret: ::c_long = 447;
 pub const SYS_process_mrelease: ::c_long = 448;
 pub const SYS_futex_waitv: ::c_long = 449;
 pub const SYS_set_mempolicy_home_node: ::c_long = 450;
+pub const SYS_fchmodat2: ::c_long = 452;
 
 // offsets in user_regs_structs, from sys/reg.h
 pub const EBX: ::c_int = 0;
diff --git a/src/unix/linux_like/linux/gnu/b64/x86_64/not_x32.rs b/src/unix/linux_like/linux/gnu/b64/x86_64/not_x32.rs
index 3831dfad9d414..e8750ec0cd8ee 100644
--- a/src/unix/linux_like/linux/gnu/b64/x86_64/not_x32.rs
+++ b/src/unix/linux_like/linux/gnu/b64/x86_64/not_x32.rs
@@ -438,6 +438,7 @@ pub const SYS_memfd_secret: ::c_long = 447;
 pub const SYS_process_mrelease: ::c_long = 448;
 pub const SYS_futex_waitv: ::c_long = 449;
 pub const SYS_set_mempolicy_home_node: ::c_long = 450;
+pub const SYS_fchmodat2: ::c_long = 452;
 
 extern "C" {
     pub fn sysctl(
diff --git a/src/unix/linux_like/linux/gnu/b64/x86_64/x32.rs b/src/unix/linux_like/linux/gnu/b64/x86_64/x32.rs
index 06aa0da2d74aa..90745b1762335 100644
--- a/src/unix/linux_like/linux/gnu/b64/x86_64/x32.rs
+++ b/src/unix/linux_like/linux/gnu/b64/x86_64/x32.rs
@@ -366,6 +366,7 @@ pub const SYS_memfd_secret: ::c_long = __X32_SYSCALL_BIT + 447;
 pub const SYS_process_mrelease: ::c_long = __X32_SYSCALL_BIT + 448;
 pub const SYS_futex_waitv: ::c_long = __X32_SYSCALL_BIT + 449;
 pub const SYS_set_mempolicy_home_node: ::c_long = __X32_SYSCALL_BIT + 450;
+pub const SYS_fchmodat2: ::c_long = __X32_SYSCALL_BIT + 452;
 pub const SYS_rt_sigaction: ::c_long = __X32_SYSCALL_BIT + 512;
 pub const SYS_rt_sigreturn: ::c_long = __X32_SYSCALL_BIT + 513;
 pub const SYS_ioctl: ::c_long = __X32_SYSCALL_BIT + 514;
diff --git a/src/unix/linux_like/linux/musl/b32/x86/mod.rs b/src/unix/linux_like/linux/musl/b32/x86/mod.rs
index 12280851e7471..7fad04677f8a4 100644
--- a/src/unix/linux_like/linux/musl/b32/x86/mod.rs
+++ b/src/unix/linux_like/linux/musl/b32/x86/mod.rs
@@ -936,6 +936,7 @@ pub const SYS_memfd_secret: ::c_long = 447;
 pub const SYS_process_mrelease: ::c_long = 448;
 pub const SYS_futex_waitv: ::c_long = 449;
 pub const SYS_set_mempolicy_home_node: ::c_long = 450;
+pub const SYS_fchmodat2: ::c_long = 452;
 
 // offsets in user_regs_structs, from sys/reg.h
 pub const EBX: ::c_int = 0;
diff --git a/src/unix/linux_like/linux/musl/b64/x86_64/mod.rs b/src/unix/linux_like/linux/musl/b64/x86_64/mod.rs
index 4d17868000ebd..677e2e4953e75 100644
--- a/src/unix/linux_like/linux/musl/b64/x86_64/mod.rs
+++ b/src/unix/linux_like/linux/musl/b64/x86_64/mod.rs
@@ -608,6 +608,7 @@ pub const SYS_memfd_secret: ::c_long = 447;
 pub const SYS_process_mrelease: ::c_long = 448;
 pub const SYS_futex_waitv: ::c_long = 449;
 pub const SYS_set_mempolicy_home_node: ::c_long = 450;
+pub const SYS_fchmodat2: ::c_long = 452;
 
 // offsets in user_regs_structs, from sys/reg.h
 pub const R15: ::c_int = 0;