diff --git a/secure/simul_efun/simul_efun.c b/secure/simul_efun/simul_efun.c
index 2a89fcf..e36d141 100644
--- a/secure/simul_efun/simul_efun.c
+++ b/secure/simul_efun/simul_efun.c
@@ -86,6 +86,7 @@
 #include __DIR__"shadow.c"
 #include __DIR__"livings.c"
 #include __DIR__"comm.c"
+#include __DIR__"files.c"
 
 #define TO        efun::this_object()
 #define TI        efun::this_interactive()