diff --git a/R/compare_models.R b/R/compare_models.R
index 8b1713c..45d8eb1 100644
--- a/R/compare_models.R
+++ b/R/compare_models.R
@@ -100,5 +100,5 @@ compare_models <- function(
     )
     message("Saving comparative performance plot to", perf_plot_spec$fname)
 
-    return(perf_tbl)
+    invisible(perf_tbl)
 }
\ No newline at end of file
diff --git a/R/prepare_and_fit.R b/R/prepare_and_fit.R
index 929efc9..f952f26 100644
--- a/R/prepare_and_fit.R
+++ b/R/prepare_and_fit.R
@@ -50,5 +50,5 @@ prepare_and_fit <- function(
         fit_obj$model_spec <- model_spec
         fits[[i]] <- fit_obj
     }
-    return(fits)
+    invisible(fits)
 }
\ No newline at end of file