diff --git a/R/onAttach.R b/R/onAttach.R
index e956271e..972d2edf 100644
--- a/R/onAttach.R
+++ b/R/onAttach.R
@@ -4,12 +4,16 @@
     return()
   }
   
-  threads_option <- getOption("ranger.num.threads")
   threads_env <- Sys.getenv("R_RANGER_NUM_THREADS")
-  if (!is.null(threads_option)) {
-    thread_string <- paste(threads_option, "threads as set by options(ranger.num.threads = N). Can be overwritten with num.threads.")
-  } else if (threads_env != "") {
+  threads_option1 <- getOption("ranger.num.threads")
+  threads_option2 <- getOption("Ncpus")
+  
+  if (threads_env != "") {
     thread_string <- paste(threads_env, "threads as set by environment variable R_RANGER_NUM_THREADS. Can be overwritten with num.threads.")
+  } else if (!is.null(threads_option1)) {
+    thread_string <- paste(threads_option1, "threads as set by options(ranger.num.threads = N). Can be overwritten with num.threads.")
+  } else if (!is.null(threads_option2)) {
+    thread_string <- paste(threads_option2, "threads as set by options(Ncpus = N). Can be overwritten with num.threads.")
   } else {
     thread_string <- "2 threads (default). Change with num.threads in ranger() and predict(), options(ranger.num.threads = N) or environment variable R_RANGER_NUM_THREADS."
   }
diff --git a/R/predict.R b/R/predict.R
index 0530654b..0b45c3ec 100644
--- a/R/predict.R
+++ b/R/predict.R
@@ -193,7 +193,7 @@ predict.ranger.forest <- function(object, data, predict.all = FALSE,
   ## Num threads
   ## Default 0 -> detect from system in C++.
   if (is.null(num.threads)) {
-    num.threads <- as.integer(Sys.getenv("R_RANGER_NUM_THREADS", getOption("ranger.num.threads", 2L)))
+    num.threads <- as.integer(Sys.getenv("R_RANGER_NUM_THREADS", getOption("ranger.num.threads", getOption("Ncpus", 2L))))
   } else if (!is.numeric(num.threads) || num.threads < 0) {
     stop("Error: Invalid value for num.threads")
   }
diff --git a/R/ranger.R b/R/ranger.R
index dc4dd823..eeaf80bf 100644
--- a/R/ranger.R
+++ b/R/ranger.R
@@ -514,7 +514,7 @@ ranger <- function(formula = NULL, data = NULL, num.trees = 500, mtry = NULL,
   ## Num threads
   ## Default 0 -> detect from system in C++.
   if (is.null(num.threads)) {
-    num.threads <- as.integer(Sys.getenv("R_RANGER_NUM_THREADS", getOption("ranger.num.threads", 2L)))
+    num.threads <- as.integer(Sys.getenv("R_RANGER_NUM_THREADS", getOption("ranger.num.threads", getOption("Ncpus", 2L))))
   } else if (!is.numeric(num.threads) || num.threads < 0) {
     stop("Error: Invalid value for num.threads")
   }