diff --git a/scrolltext/scrolltext3.c b/scrolltext/scrolltext3.c
index 34d9fbe..57dbcd1 100644
--- a/scrolltext/scrolltext3.c
+++ b/scrolltext/scrolltext3.c
@@ -1,7 +1,5 @@
 #define SCROLLTEXT_C
 
-#define _XOPEN_SOURCE 600
-
 #include <stdlib.h>
 #include <string.h>
 #include <setjmp.h>
diff --git a/simulator/main.c b/simulator/main.c
index 5e543af..6f8f87d 100644
--- a/simulator/main.c
+++ b/simulator/main.c
@@ -4,7 +4,6 @@
 	#include <process.h>
 #define pthread_t int
 #else
-	#define _XOPEN_SOURCE 500
 	#ifdef OSX_
 		#include <GLUT/glut.h>
 	#else
diff --git a/simulator/util.c b/simulator/util.c
index 57c49cb..cc0d394 100644
--- a/simulator/util.c
+++ b/simulator/util.c
@@ -1,7 +1,5 @@
 #ifdef _WIN32
 	#include <windows.h>
-#else
-	#define _XOPEN_SOURCE 500
 #endif
 
 #include <stdlib.h>