diff --git a/1992/gson/gson.c b/1992/gson/gson.c
index 86cc5fda2..cb31ab113 100644
--- a/1992/gson/gson.c
+++ b/1992/gson/gson.c
@@ -1,5 +1,9 @@
 #include <stdio.h> 
+#include <unistd.h>
 #include <limits.h>
+#ifndef ARG_MAX
+#define ARG_MAX _POSIX_ARG_MAX
+#endif
 long a
 [4],b[
 4],c[4]