diff --git a/libc/unistd/sysconf.cpp b/libc/unistd/sysconf.cpp
index c37694b0..c1b1d7c2 100644
--- a/libc/unistd/sysconf.cpp
+++ b/libc/unistd/sysconf.cpp
@@ -1,6 +1,6 @@
 /*******************************************************************************
 
-    Copyright(C) Jonas 'Sortie' Termansen 2013.
+    Copyright(C) Jonas 'Sortie' Termansen 2013, 2014.
 
     This file is part of the Sortix C Library.
 
@@ -36,6 +36,7 @@ extern "C" long sysconf(int name)
 		return getpagesize();
 	case _SC_OPEN_MAX: return 0x10000;
 	case _SC_RTSIG_MAX: return (SIGRTMAX+1) - SIGRTMIN;
+	case _SC_GETGR_R_SIZE_MAX: return -1;
 	default:
 		fprintf(stderr, "%s:%u warning: %s(%i) is unsupported\n",
 		        __FILE__, __LINE__, __func__, name);