diff --git a/common/vncauth.c b/common/vncauth.c
index 0b20f53..9434ae4 100644
--- a/common/vncauth.c
+++ b/common/vncauth.c
@@ -21,11 +21,6 @@
  * vncauth.c - Functions for VNC password management and authentication.
  */
 
-#ifdef __STRICT_ANSI__
-#define _BSD_SOURCE
-#define _POSIX_SOURCE
-#define _XOPEN_SOURCE 600
-#endif
 #ifdef LIBVNCSERVER_HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
diff --git a/examples/vncev.c b/examples/vncev.c
index b185746..a8e0884 100644
--- a/examples/vncev.c
+++ b/examples/vncev.c
@@ -2,9 +2,6 @@
  * @example vncev.c
  * This program is a simple server to show events coming from the client
 */
-#ifdef __STRICT_ANSI__
-#define _BSD_SOURCE
-#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/types.h>
diff --git a/libvncclient/listen.c b/libvncclient/listen.c
index e989d6a..37def52 100644
--- a/libvncclient/listen.c
+++ b/libvncclient/listen.c
@@ -22,9 +22,6 @@
  * listen.c - listen for incoming connections
  */
 
-#ifdef __STRICT_ANSI__
-#define _BSD_SOURCE
-#endif
 #include <unistd.h>
 #include <sys/types.h>
 #ifdef WIN32
diff --git a/libvncclient/rfbproto.c b/libvncclient/rfbproto.c
index 1f4b646..44d0a46 100644
--- a/libvncclient/rfbproto.c
+++ b/libvncclient/rfbproto.c
@@ -23,11 +23,6 @@
  * rfbproto.c - functions to deal with client side of RFB protocol.
  */
 
-#ifdef __STRICT_ANSI__
-#define _BSD_SOURCE
-#define _POSIX_SOURCE
-#define _XOPEN_SOURCE 600
-#endif
 #ifndef WIN32
 #include <unistd.h>
 #include <sys/types.h>
diff --git a/libvncclient/sockets.c b/libvncclient/sockets.c
index 2963432..8d2eb98 100644
--- a/libvncclient/sockets.c
+++ b/libvncclient/sockets.c
@@ -22,14 +22,6 @@
  * sockets.c - functions to deal with sockets.
  */
 
-#ifdef __STRICT_ANSI__
-#define _BSD_SOURCE
-#ifdef __linux__
-/* Setting this on other systems hides definitions such as INADDR_LOOPBACK.
- * The check should be for __GLIBC__ in fact. */
-# define _POSIX_SOURCE
-#endif
-#endif
 #include <unistd.h>
 #include <errno.h>
 #include <fcntl.h>
diff --git a/libvncclient/tls_openssl.c b/libvncclient/tls_openssl.c
index a531778..00d031d 100644
--- a/libvncclient/tls_openssl.c
+++ b/libvncclient/tls_openssl.c
@@ -18,10 +18,6 @@
  *  USA.
  */
 
-#ifndef _MSC_VER
-#define _XOPEN_SOURCE 500
-#endif
-
 #include <rfb/rfbclient.h>
 #include <errno.h>
 
diff --git a/libvncclient/vncviewer.c b/libvncclient/vncviewer.c
index 3f85c06..8a59c6d 100644
--- a/libvncclient/vncviewer.c
+++ b/libvncclient/vncviewer.c
@@ -30,10 +30,6 @@
 #define strdup _strdup /* Prevent POSIX deprecation warnings */
 #endif
 
-#ifdef __STRICT_ANSI__
-#define _BSD_SOURCE
-#define _POSIX_SOURCE
-#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/libvncserver/httpd.c b/libvncserver/httpd.c
index 8634b15..80adbcf 100644
--- a/libvncserver/httpd.c
+++ b/libvncserver/httpd.c
@@ -23,11 +23,6 @@
  *  USA.
  */
 
-#ifdef __STRICT_ANSI__
-#define _BSD_SOURCE
-#define _POSIX_SOURCE
-#endif
-
 #include <rfb/rfb.h>
 
 #include <ctype.h>
diff --git a/libvncserver/main.c b/libvncserver/main.c
index 4fbe036..c185eb8 100644
--- a/libvncserver/main.c
+++ b/libvncserver/main.c
@@ -12,9 +12,6 @@
  */
 
 extern "C" {
-	#ifdef __STRICT_ANSI__
-	#define _BSD_SOURCE
-	#endif
 	#include <rfb/rfb.h>
 	#include <rfb/rfbregion.h>
 	#include "private.h"
diff --git a/libvncserver/rfbserver.c b/libvncserver/rfbserver.c
index 44723ef..fa8423d 100644
--- a/libvncserver/rfbserver.c
+++ b/libvncserver/rfbserver.c
@@ -27,12 +27,6 @@
  *  USA.
  */
 
-#ifdef __STRICT_ANSI__
-#define _BSD_SOURCE
-#define _POSIX_SOURCE
-#define _XOPEN_SOURCE 600
-#endif
-
 #include <stdio.h>
 #include <string.h>
 #include <rfb/rfb.h>
diff --git a/libvncserver/scale.c b/libvncserver/scale.c
index 3ca76dc..bf67f8e 100644
--- a/libvncserver/scale.c
+++ b/libvncserver/scale.c
@@ -25,9 +25,6 @@
  *  USA.
  */
 
-#ifdef __STRICT_ANSI__
-#define _BSD_SOURCE
-#endif
 #include <string.h>
 #include <rfb/rfb.h>
 #include <rfb/rfbregion.h>
diff --git a/libvncserver/sockets.c b/libvncserver/sockets.c
index bbc3d90..e4fc52b 100644
--- a/libvncserver/sockets.c
+++ b/libvncserver/sockets.c
@@ -42,15 +42,6 @@
  *  USA.
  */
 
-#ifdef __STRICT_ANSI__
-#define _BSD_SOURCE
-#ifdef __linux__
-/* Setting this on other systems hides definitions such as INADDR_LOOPBACK.
- * The check should be for __GLIBC__ in fact. */
-# define _POSIX_SOURCE
-#endif
-#endif
-
 #include <rfb/rfb.h>
 
 #ifdef LIBVNCSERVER_HAVE_SYS_TYPES_H
diff --git a/libvncserver/websockets.c b/libvncserver/websockets.c
index bdec8f3..f5dd120 100644
--- a/libvncserver/websockets.c
+++ b/libvncserver/websockets.c
@@ -26,10 +26,6 @@
  *  USA.
  */
 
-#ifdef __STRICT_ANSI__
-#define _BSD_SOURCE
-#endif
-
 #include <rfb/rfb.h>
 /* errno */
 #include <errno.h>
diff --git a/test/copyrecttest.c b/test/copyrecttest.c
index cd2a504..3564c0e 100644
--- a/test/copyrecttest.c
+++ b/test/copyrecttest.c
@@ -1,6 +1,3 @@
-#ifdef __STRICT_ANSI__
-#define _BSD_SOURCE
-#endif
 #include <rfb/rfb.h>
 #include <math.h>
 
diff --git a/test/encodingstest.c b/test/encodingstest.c
index 715e887..1d8e861 100644
--- a/test/encodingstest.c
+++ b/test/encodingstest.c
@@ -1,6 +1,3 @@
-#ifdef __STRICT_ANSI__
-#define _BSD_SOURCE
-#endif
 #include <time.h>
 #include <stdarg.h>
 #include <rfb/rfb.h>