diff --git a/headers/posix/unistd.h b/headers/posix/unistd.h
index bebe2be9eb..ea43538c92 100644
--- a/headers/posix/unistd.h
+++ b/headers/posix/unistd.h
@@ -36,6 +36,7 @@
 #define _POSIX_SAVED_IDS		1
 #define _POSIX_VDISABLE			((char)-2)	/* TODO: Check this! */
 #define _POSIX_SEMAPHORES		(200112L)
+#define _POSIX_THREADS			(200112L)
 
 /* pathconf() constants */
 #define _PC_CHOWN_RESTRICTED	1
@@ -66,6 +67,7 @@
 #define _SC_SEM_NSEMS_MAX		28
 #define _SC_SEM_VALUE_MAX		29
 #define _SC_SEMAPHORES			30
+#define _SC_THREADS				31
 
 /* lseek() constants */
 #ifndef SEEK_SET
diff --git a/src/system/libroot/posix/unistd/conf.c b/src/system/libroot/posix/unistd/conf.c
index ac2894a9e9..1dddd5b9ac 100644
--- a/src/system/libroot/posix/unistd/conf.c
+++ b/src/system/libroot/posix/unistd/conf.c
@@ -68,6 +68,8 @@ sysconf(int name)
 			return MAX_POSIX_SEM_VALUE;
 		case _SC_SEMAPHORES:
 			return _POSIX_SEMAPHORES;
+		case _SC_THREADS:
+			return _POSIX_THREADS;
 	}
 
 	return -1;