diff --git a/DC_theme_generator.R b/DC_theme_generator.R
index fd83373..4d568ec 100644
--- a/DC_theme_generator.R
+++ b/DC_theme_generator.R
@@ -52,7 +52,7 @@ DC_theme_generator <- function(type,
         panel.border = element_rect(linetype = 1, 
                                     colour = "black",
                                     fill=NA,
-                                    size=1),
+                                    linewidth=1),
         panel.background=element_blank(),
         panel.grid.major.x=element_line(color=x_gridline),
         panel.grid.major.y=element_line(color=y_gridline),