diff --git a/src/unix/linux_like/linux/uclibc/arm/mod.rs b/src/unix/linux_like/linux/uclibc/arm/mod.rs
index 25125bcc9b3d8..716887248525b 100644
--- a/src/unix/linux_like/linux/uclibc/arm/mod.rs
+++ b/src/unix/linux_like/linux/uclibc/arm/mod.rs
@@ -466,6 +466,7 @@ pub const POLLWRBAND: ::c_short = 0x200;
 pub const POLLWRNORM: ::c_short = 0x100;
 pub const PTHREAD_STACK_MIN: ::size_t = 16384;
 pub const RTLD_GLOBAL: ::c_int = 0x00100;
+pub const PIDFD_NONBLOCK: ::c_int = 0x800;
 
 // These are typed unsigned to match sigaction
 pub const SA_NOCLDSTOP: ::c_ulong = 0x1;
diff --git a/src/unix/linux_like/linux/uclibc/mips/mod.rs b/src/unix/linux_like/linux/uclibc/mips/mod.rs
index 61684094fa9f8..963f5bda7e68d 100644
--- a/src/unix/linux_like/linux/uclibc/mips/mod.rs
+++ b/src/unix/linux_like/linux/uclibc/mips/mod.rs
@@ -52,6 +52,7 @@ pub const O_ASYNC: ::c_int = 0x1000;
 pub const O_NDELAY: ::c_int = 0x80;
 
 pub const SOCK_NONBLOCK: ::c_int = 128;
+pub const PIDFD_NONBLOCK: ::c_int = 128;
 
 pub const EDEADLK: ::c_int = 45;
 pub const ENAMETOOLONG: ::c_int = 78;
diff --git a/src/unix/linux_like/linux/uclibc/x86_64/mod.rs b/src/unix/linux_like/linux/uclibc/x86_64/mod.rs
index 43ac79296b368..a2b8f7f5dbb46 100644
--- a/src/unix/linux_like/linux/uclibc/x86_64/mod.rs
+++ b/src/unix/linux_like/linux/uclibc/x86_64/mod.rs
@@ -330,6 +330,7 @@ pub const __SIZEOF_PTHREAD_COND_T: usize = 48;
 pub const __SIZEOF_PTHREAD_CONDATTR_T: usize = 4;
 pub const __SIZEOF_PTHREAD_RWLOCK_T: usize = 56;
 pub const __SIZEOF_PTHREAD_RWLOCKATTR_T: usize = 8;
+pub const PIDFD_NONBLOCK: ::c_int = 04000;
 
 cfg_if! {
     if #[cfg(target_os = "l4re")] {