diff --git a/R/Design-methods.R b/R/Design-methods.R
index 7f07e459f..a7d677331 100644
--- a/R/Design-methods.R
+++ b/R/Design-methods.R
@@ -93,7 +93,7 @@ get_result_list <- function(
   } else {
     # Process all simulations.
     cores <- min(
-      safeInteger(parallel),
+      safeInteger(n_cores),
       parallelly::availableCores()
     )
 
@@ -144,7 +144,7 @@ get_result_list <- function(
     # Stop the cluster.
     parallel::stopCluster(cl)
 
-    return(res)
+    res
   }
 }