diff --git a/lib/auth/sia/sia.c b/lib/auth/sia/sia.c
index d8da60240..f53bae640 100644
--- a/lib/auth/sia/sia.c
+++ b/lib/auth/sia/sia.c
@@ -46,6 +46,7 @@ RCSID("$Id$");
 #include <pwd.h>
 
 #include <krb.h>
+#include <kafs.h>
 
 
 #ifndef POSIX_GETPWNAM_R