diff --git a/scsh/syscalls1.c b/scsh/syscalls1.c
index 31550d3..726cb74 100644
--- a/scsh/syscalls1.c
+++ b/scsh/syscalls1.c
@@ -37,6 +37,7 @@
 #include <crypt.h> 
 #endif
 #include "cstuff.h"
+#include <limits.h>     /* NGROUPS_MAX on solaris */
 
 /* Make sure our exports match up w/the implementation: */
 #include "syscalls1.h"