diff --git a/R/pool.r b/R/pool.r
index 31edd8f..eb5132a 100644
--- a/R/pool.r
+++ b/R/pool.r
@@ -102,10 +102,10 @@ Pool = R6::R6Class("Pool",
         },
 
         cleanup = function(timeout=5) {
-            info = self$info()
             success = private$master$close(as.integer(timeout*1000))
             success = self$workers$cleanup(success, timeout) # timeout left?
 
+            info = self$info()
             max_mem = max(c(info$mem.max+2e8, 0), na.rm=TRUE) # add 200 Mb
             max_mem_str = format(structure(max_mem, class="object_size"), units="auto")
 
diff --git a/src/CMQMaster.h b/src/CMQMaster.h
index 77a245d..ae1ff28 100644
--- a/src/CMQMaster.h
+++ b/src/CMQMaster.h
@@ -265,9 +265,9 @@ class CMQMaster {
 private:
     struct worker_t {
         std::set<std::string> env;
-        SEXP call {R_NilValue};
-        SEXP time {Rcpp::List()};
-        SEXP mem {Rcpp::List()};
+        Rcpp::RObject call {R_NilValue};
+        Rcpp::RObject time {R_NilValue};
+        Rcpp::RObject mem {R_NilValue};
         wlife_t status;
         std::string via;
         int n_calls {-1};