diff --git a/cinelerra-5.1/cinelerra/theme.C b/cinelerra-5.1/cinelerra/theme.C
index d89c789f..ea96309c 100644
--- a/cinelerra-5.1/cinelerra/theme.C
+++ b/cinelerra-5.1/cinelerra/theme.C
@@ -274,6 +274,7 @@ void Theme::build_menus()
 	aspect_ratios.append(new BC_ListBoxItem("3:2"));
 	aspect_ratios.append(new BC_ListBoxItem("4:3"));
 	aspect_ratios.append(new BC_ListBoxItem("16:9"));
+	aspect_ratios.append(new BC_ListBoxItem("16:10"));
 	aspect_ratios.append(new BC_ListBoxItem("2.10:1"));
 	aspect_ratios.append(new BC_ListBoxItem("2.20:1"));
 	aspect_ratios.append(new BC_ListBoxItem("2.25:1"));