diff --git a/libvncserver/sockets.c b/libvncserver/sockets.c
index 15b40ac..2345248 100644
--- a/libvncserver/sockets.c
+++ b/libvncserver/sockets.c
@@ -41,6 +41,11 @@
  *  USA.
  */
 
+#ifdef __STRICT_ANSI__
+#define _BSD_SOURCE
+#define _POSIX_SOURCE
+#endif
+
 #include <rfb/rfb.h>
 
 #ifdef LIBVNCSERVER_HAVE_SYS_TYPES_H
diff --git a/libvncserver/websockets.c b/libvncserver/websockets.c
index 6bad3aa..f7e3d04 100644
--- a/libvncserver/websockets.c
+++ b/libvncserver/websockets.c
@@ -26,6 +26,11 @@
  *  USA.
  */
 
+#ifdef __STRICT_ANSI__
+#define _BSD_SOURCE
+#define _POSIX_SOURCE
+#endif
+
 #include <rfb/rfb.h>
 #include <resolv.h> /* __b64_ntop */
 /* errno */