diff --git a/include/llvm/Config/config.h.in b/include/llvm/Config/config.h.in
index 3d2c9aba237..0068c5169c2 100644
--- a/include/llvm/Config/config.h.in
+++ b/include/llvm/Config/config.h.in
@@ -267,9 +267,6 @@
 /* Define to have the %a format string */
 #undef HAVE_PRINTF_A
 
-/* Define to 1 if you have the <pthread.h> header file. */
-#undef HAVE_PTHREAD_H
-
 /* Have pthread_mutex_lock */
 #undef HAVE_PTHREAD_MUTEX_LOCK