diff --git a/httpserver.h b/httpserver.h
index 27cda0b..38758b7 100644
--- a/httpserver.h
+++ b/httpserver.h
@@ -316,6 +316,8 @@ int main() {
 #define KQUEUE
 #endif
 
+#define _DEFAULT_SOURCE
+
 #include <time.h>
 #include <stdlib.h>
 #include <stdio.h>