diff --git a/R/Utils.R b/R/Utils.R
index 6dbe71be414e98ee67629ef2b2af91b36003f5bf..7dd28d773238b83ff2389f4f3077b18581a17a49 100644
--- a/R/Utils.R
+++ b/R/Utils.R
@@ -20,7 +20,7 @@
 ## table of feature models
 .FeatModels <- function() {
   path <- system.file("modelsFeatures/FeatModelsGR.csv", package = "airGR")
-  read.table(path, header = TRUE, sep = ";")
+  read.table(path, header = TRUE, sep = ";", stringsAsFactors = FALSE)
 }