diff --git a/src/header/unistd/sysconf.rs b/src/header/unistd/sysconf.rs
index 423d4d49dd..c50c53de25 100644
--- a/src/header/unistd/sysconf.rs
+++ b/src/header/unistd/sysconf.rs
@@ -20,6 +20,7 @@ pub const _SC_PAGE_SIZE: c_int = 30;
 // ...
 pub const _SC_RE_DUP_MAX: c_int = 44;
 // ...
+pub const _SC_GETGR_R_SIZE_MAX: c_int = 69;
 pub const _SC_GETPW_R_SIZE_MAX: c_int = 70;
 pub const _SC_LOGIN_NAME_MAX: c_int = 71;
 pub const _SC_TTY_NAME_MAX: c_int = 72;
@@ -45,6 +46,7 @@ pub extern "C" fn sysconf(name: c_int) -> c_long {
             .try_into()
             .expect("page size not representable as type `long`"),
         _SC_RE_DUP_MAX => 32767,
+        _SC_GETGR_R_SIZE_MAX => -1,
         _SC_GETPW_R_SIZE_MAX => -1,
         _SC_LOGIN_NAME_MAX => 256,
         _SC_TTY_NAME_MAX => 32,