diff --git a/src/allocator_thread.c b/src/allocator_thread.c
index cb4e987..acc11d7 100644
--- a/src/allocator_thread.c
+++ b/src/allocator_thread.c
@@ -1,7 +1,6 @@
 #undef _GNU_SOURCE
 #define _GNU_SOURCE
 #undef _POSIX_C_SOURCE
-#define _POSIX_C_SOURCE 200809L
 #define _DARWIN_C_SOURCE
 #include <limits.h>
 #include <pthread.h>