diff --git a/src/unix/bsd/openbsdlike/bitrig.rs b/src/unix/bsd/openbsdlike/bitrig.rs
index e25f3ff8f0d54..e7b0f59c0a80e 100644
--- a/src/unix/bsd/openbsdlike/bitrig.rs
+++ b/src/unix/bsd/openbsdlike/bitrig.rs
@@ -206,6 +206,7 @@ pub const PTHREAD_RWLOCK_INITIALIZER: pthread_rwlock_t = 0 as *mut _;
 pub const PTHREAD_MUTEX_RECURSIVE: ::c_int = 2;
 
 pub const HW_AVAILCPU: ::c_int = 25;
+pub const KERN_PROC_ARGS: ::c_int = 55;
 
 extern {
     pub fn mprotect(addr: *const ::c_void, len: ::size_t, prot: ::c_int)
diff --git a/src/unix/bsd/openbsdlike/mod.rs b/src/unix/bsd/openbsdlike/mod.rs
index 4433173ad13b8..eb19963419066 100644
--- a/src/unix/bsd/openbsdlike/mod.rs
+++ b/src/unix/bsd/openbsdlike/mod.rs
@@ -355,6 +355,8 @@ pub const _SC_TZNAME_MAX : ::c_int = 27;
 pub const _SC_PAGESIZE : ::c_int = 28;
 pub const _SC_FSYNC : ::c_int = 29;
 
+pub const KERN_PROC_ARGV: ::c_int = 1;
+
 extern {
     pub fn mincore(addr: *mut ::c_void, len: ::size_t,
                    vec: *mut ::c_char) -> ::c_int;
diff --git a/src/unix/bsd/openbsdlike/netbsd.rs b/src/unix/bsd/openbsdlike/netbsd.rs
index 4d01d73812dde..970ed85b9f23c 100644
--- a/src/unix/bsd/openbsdlike/netbsd.rs
+++ b/src/unix/bsd/openbsdlike/netbsd.rs
@@ -271,6 +271,7 @@ pub const PTHREAD_RWLOCK_INITIALIZER: pthread_rwlock_t = pthread_rwlock_t {
     ptr_private: 0 as *mut _,
 };
 pub const PTHREAD_MUTEX_RECURSIVE: ::c_int = 2;
+pub const KERN_PROC_ARGS: ::c_int = 48;
 
 extern {
     pub fn mprotect(addr: *mut ::c_void, len: ::size_t, prot: ::c_int)
diff --git a/src/unix/bsd/openbsdlike/openbsd.rs b/src/unix/bsd/openbsdlike/openbsd.rs
index 39dbb65183bf6..76f946d9af579 100644
--- a/src/unix/bsd/openbsdlike/openbsd.rs
+++ b/src/unix/bsd/openbsdlike/openbsd.rs
@@ -209,6 +209,7 @@ pub const PTHREAD_RWLOCK_INITIALIZER: pthread_rwlock_t = 0 as *mut _;
 pub const PTHREAD_MUTEX_RECURSIVE: ::c_int = 2;
 
 pub const HW_AVAILCPU: ::c_int = 25;
+pub const KERN_PROC_ARGS: ::c_int = 55;
 
 extern {
     pub fn mprotect(addr: *const ::c_void, len: ::size_t, prot: ::c_int)