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-rw-r--r--posix/unistd.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/posix/unistd.h b/posix/unistd.h
index 6aa05d6b03..8669c7b61b 100644
--- a/posix/unistd.h
+++ b/posix/unistd.h
@@ -506,7 +506,7 @@ extern long int pathconf (__const char *__path, int __name) __THROW;
 extern long int fpathconf (int __fd, int __name) __THROW;
 
 /* Get the value of the system variable NAME.  */
-extern long int sysconf (int __name) __THROW;
+extern long int sysconf (int __name) __THROW __attribute__ ((__const__));
 
 #ifdef	__USE_POSIX2
 /* Get the value of the string-valued system variable NAME.  */