diff --git a/R/draw.R b/R/draw.R
index 84aeb2e..a59ffba 100644
--- a/R/draw.R
+++ b/R/draw.R
@@ -9,7 +9,7 @@ ggplot_to_gtable <- function(plot)
   if (methods::is(plot, "ggplot")){
     ggplot2::ggplotGrob(plot)
   }
-  else if (is(plot, "gtable")){
+  else if (methods::is(plot, "gtable")){
     plot
   }
   else{