diff --git a/luad.c b/luad.c
index 1a9f0b3..f32b7b0 100644
--- a/luad.c
+++ b/luad.c
@@ -104,7 +104,7 @@ int start_lua_child(lua_State *L,
 
     fflush(stdout); fflush(stderr);
     for(int i=0; i < 3; i++) {
-        if(fds[i] > 0) dup2(fds[i], i);
+        dup2(fds[i], i);
     }
 
     lua_newtable(L);            /* arg */