diff --git a/R/R/prophet.R b/R/R/prophet.R
index ab7c9ff..0f22f01 100644
--- a/R/R/prophet.R
+++ b/R/R/prophet.R
@@ -416,7 +416,7 @@ set_auto_seasonalities <- function(m) {
   last <- max(m$history$ds)
   if (m$yearly.seasonality == 'auto') {
     if (last - first < 730) {
-      warn('Disabling yearly seasonality. ',
+      warning('Disabling yearly seasonality. ',
            'Run prophet with `yearly.seasonality=TRUE` to override this.')
       m$yearly.seasonality <- FALSE
     } else {