diff --git a/R/check-input-helpers.R b/R/check-input-helpers.R
index 0b1c820e2..f0a5f99ac 100644
--- a/R/check-input-helpers.R
+++ b/R/check-input-helpers.R
@@ -119,7 +119,6 @@ ensure_model_column <- function(data) {
 check_number_per_forecast <- function(data, forecast_unit) {
   data <- ensure_data.table(data)
   data <- na.omit(data)
-  assert_subset(forecast_unit, colnames(data))
   # check whether there are the same number of quantiles, samples --------------
   data[, scoringutils_InternalNumCheck := length(predicted), by = forecast_unit]
   n <- unique(data$scoringutils_InternalNumCheck)