diff --git a/R/plot_calendar.R b/R/plot_calendar.R
index acc1778..e7736be 100644
--- a/R/plot_calendar.R
+++ b/R/plot_calendar.R
@@ -49,7 +49,7 @@ plot_calendar <- function(
       )
     } else {
       if (!is.null(labels)) {
-        mapping2 <- aes(label = format(x, labels))
+        mapping2 <- aes(label = format(ggplot2::after_stat(x), labels))
         mapping$label <- mapping2$label
       }