--- a/lib-src/libnyquist/nyquist/xlisp/security.c
+++ b/lib-src/libnyquist/nyquist/xlisp/security.c
@@ -4,6 +4,7 @@
  */
 
 #include <stdlib.h>
+#include "switches.h"
 #if defined(UNIX) || defined(__APPLE__) || defined(__CYGWIN__)
 #include <unistd.h>
 #endif